Mercruiser Thermostat Kits

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Sierra Thermostat Kit

Mallory Thermostat Kit

120/2.5L(2)2324347UP18-3650 9-43153
140 (4 CYL)/3.0L2508261UP18-3650(8) 9-43153
3.0L/3.0LXC856559UP18-3650 9-43153
1652770032581343318-3650 9-43153
165/3.7L (4 CYL)6916779UP18-3667 -
170 (4 CYL)6916779UP18-3667 -
175/4.3L, 4.3LX (262 CID)(3)B527955UP18-3668 9-43150
175/4.3L, 4.3 LX (262 CID)(4)B527955UP18-3668 9-43150
175/4.3L, 4.3 LX (262 CID)(4)F001220UP18-3648 9-43100
180/3.7L-LX (4 CYL)6916779UP18-3667 -
185 (229 CID)6330183691965518-3668 9-43150
185 (262 CID)A331455B52795418-3668 9-43150
190 (4 CYL)6916779UP18-3667 -
200 GM6218462B52598118-3668 9-43150
200/5.0L0B5259820F60099918-3647 9-43157
200/5.0L GM(3)B525982UP18-3668 9-43150
200/5.0L GM(4)B525982UP18-3648 9-43100
205 (262 CID)A331455B52795418-3668 9-43150
205/4.3L, 4.3LX (262 CID)(3)B527955D71436918-3668 9-43150
205/4.3L, 4.3 LX (262 CID)(4)B527955D71436918-3668 9-43150
205/4.3L, 4.3 LX (262 CID)(4)F001220UP18-3648 9-43100
215 FORD3040411UP18-3651 9-43152
215 FORD MCM/MIE3040411338572018-3646 9-43151
225 FORD MCM/MIE3385721417699918-3646 9-43151
225 GM2278647239919718-3668 9-43150
225 GM2399198269401418-3651 9-43152
225/225S FORD3385721UP18-3651 9-43152
228 GM MCM/MIE4765100621846118-3646 9-43151
228 GM4765100621846118-3651 9-43152
228 GM6218462B52598118-3668 9-43150
230 GM6218462B52598118-3668 9-43150
230 MIE59070580B522550518-3646 9-43151
230 GM IB(5)5907058B52250518-3668 9-43150
230 GM IB(6)5907058B52250518-3651 9-43152
230/5.0L GM IB(5)B522506B52598118-3668 9-43150
230/5.0L GM IB(5)B522506B52598118-3648 9-43100
230/5.0L GM IB(6)B522506B52598118-3651 9-43152
230/5.0L-LX GM(3)B525982F60099918-3668 9-43150
230/5.0L-LX GM(4)B525982UP18-3668 9-43150
230/5.0L GM IB(4)B522506B52598118-3648 9-43100
230/5.0L-LX GMB525982F60099918-3648 9-43100
230/5.0L MIE0B5225060B78815118-3646 9-43151
230/5.0LX GM0B5259820F60099918-3647 9-43157
233 FORD4173000UP18-3651 9-43152
233 FORD MIE4173000490230418-3646 9-43151
250 GM2314301263985418-3651 9-43152
250 GM4768000490884918-3651 9-43152
250 GM4768000490884918-3646 9-43151
250 GM MCM/MIE2314301263985418-3646 9-43151
250 GM MCM/MIE4175500590705718-3646 9-43151
255 FORD3258728UP18-3651 9-43152
255 FORD MCM/MIE3258728417829918-3646 9-43151
255 GM4175500476799918-3651 9-43152
260 GM4908850621846118-3651 9-43152
260 GM6218462B52598118-3668 9-43150
260 GM4908850621846118-3646 9-43151
260 GM IB(5)5907058B52250518-3668 9-43150
260 GM IB(6)5907058B52250518-3651 9-43152
260 MIE59070580B52250518-3646 9-43151
260/5.7L GM IB(5)B522506B52598118-3668 9-43150
260/5.7L GM IB(5)B522506B52598118-3668 9-43150
260/5.7L GM IB(5)B522506B52598118-3648 9-43100
260/5.7L GM IB(6)B522506B52598118-3651 9-43152
260/5.7L GM(3)B525982F60099918-3668 9-43150
260/5.7L GM(4)B525982F60099918-3668 9-43150
260/5.7L GM(4)B525982F60099918-3648 9-43100
260/5.7L GM0B5259820F60099918-3647 9-43157
260/5.7L MIE0B5225060F02499918-3646 9-43151
262 MAG ALPHA0F8038000K99999918-3647 9-43157
262 MAG BRAVO0F8038000K99999918-3647 9-43157
350 MagB525982F60099918-3668 9-43150
4.3L/LX GM0F0008780F60112618-3647 9-43157
4.3L/LX/LXH ALPHA0F6011270K99999918-3647 9-43157
4.3L/LX/LXH BRAVO0F6011270K99999918-3647 9-43157
4.3L/LH/EFI ALPHA0L010044UP18-3647 9-43157
4.3L/LH/EFI0L010044UP18-3647 9-43157
5.0L/EFI ALPHA0L012052UP18-3647 9-43157
5.0L/EFI BRAVO0L012052UP18-3647 9-43157
5.7 GM ALPHA0F2255600K99999918-3647 9-43157
5.7 GM BRAVO0F2255600K99999918-3647 9-43157
5.7L/EFI GM ALPHA0L010037UP18-3647 9-43157
5.7L/EFI GM BRAVO0L010037UP18-3647 9-43157
5.7 GM (SKI)A338553B51462618-3668 9-43150
5.7L SKI0B514627UP18-3647 9-43157
5.7 GM SKI/BRAVO(3)B514627UP18-3668 9-43150
5.7 GM SKI/BRAVO(4)B514627UP18-3668 9-43150
5.7 GM SKI/BRAVO(4)B514627UP18-3648 9-43100
5.7L MIE0F0250000F62209918-3647 9-43157
5.7L MIE0F6221000K99999918-3647 9-43157
5.7L MIE0F6221000K99999918-3647 9-43157
5.7L MIE0L002003UP18-3647 9-43157
270 GM2851074307773518-3651 9-43152
270 GM MCM/MIE2851074338572018-3646 9-43151
280 GM4176250477019918-3646 9-43151
280 GM TRS4176250477019918-3651 9-43152
300 MR/TRS GM6668677B43036718-3668 9-43150
320 GM EFIA543604UP18-3651 9-43152
320 GM0A5436040C62241818-3646 9-43151
325 GM MCM/MIE2278747378044918-3646 9-43151
325 GM2278747231396418-3668 9-43150
325 GM2313965304273018-3651 9-43152
325 GM3042731UP18-3651 9-43152
330 GM4623115UP18-3651 9-43152
330 GM MCM/MIE46231150B81654018-3646 9-43151
330 GM W/BW(5)6083145UP18-3668 9-43150
330 GM W/BW(6)6083145UP18-3651 9-43152
340/7.4L GM IB(5)5889914UP18-3668 9-43150
340/7.4L GM IB(5)5889914UP18-3668 9-43150
340/7.4L GM IB(6)5889914UP18-3651 9-43152
340/7.4L MIE58899140D71549318-3646 9-43151
350 MAG0B2528820K99999918-3647 9-43157
350 MAG0B2528820K99999918-3647 9-43157
350 MAG SKI0D5054500K99999918-3647 9-43157
350 MAG EFI SKI0F2155610K99999918-3647 9-43157
350 MAG MPI/MIE0L010019UP18-3647 9-43157
350 MAG MPI SKI0F350583UP18-3647 9-43157
SCORPION SKI0F800000UP18-3647 9-43157
7.4 BRAVO GM(3)B771113D60311718-3668 9-43150
7.4 BRAVO GM(4)B771113UP18-3668 9-43150
7.4 BRAVO GM(4)D603118UP18-3648 9-43100
7.4L W/HURTH IB(5)C391564D71549318-3668 9-43150
7.4L W/HURTH IB(6)C391564UP18-3651 9-43152
7.4L W/HURTH IBD715494UP18-3648 9-43100
7.4L/LX GM0F3520000K99999918-3647 9-43157
7.4L MPI/TBI0F563052UP18-3647 9-43157
7.4L MIE0C3915640D71549318-3646 9-43151
7.4L MIE0C3915640F34999918-3646 9-43151
7.4L MIE0D7154940F82014118-3646 9-43151
7.4L MIE0F8201420K99999918-3647 9-43157
7.4L MIE0F8201420K99999918-3647 9-43157
350 GM3780450UP18-3651 9-43152
350 GM (MAGNUM)A635178B52598118-3668 9-43150
350 GM (MAGNUM)(3)B525982UP18-3668 9-43150
350 GM (MAGNUM)(4)B525982UP18-3668 9-43150
350 GM (MAGNUM)(4)B525982UP18-3648 9-43100
350 MIE3780450462310918-3646 9-43151
370 GM4179554672152718-3646 9-43151
370 TRS GM4179554672152718-3651 9-43152
370 TRS GM6721528UP18-3668 9-43150
390 GM2781129282505918-3651 9-43152
390 GM MCM/MIE2781129304273118-3646 9-43151
400 GM41795540B45764418-3646 9-43151
400 TRS GM4179554UP18-3651 9-43152
420 GMA398941UP18-3651 9-43152
420 GM0A3989410B62241818-3646 9-43151
440 TRS GM4179554UP18-3651 9-43152
454 GM MAGNUM/ALPHA(3)A631894B78514818-3668 9-43150
454 GM MAGNUM/BRAVO(4)A631894UP18-3668 9-43150
454 GM MAGNUM/BRAVO(4)B721206UP18-3648 9-43100
454 MAG MCM/SKI0F3050000K99999918-3647 9-43157
460 TRS GM4179554UP18-3651 9-43152
4704208730621803618-3652 -
4706218037UP18-3667 -
4855685394UP18-3652 -
4886170297UP18-3667 -
500(Gen V)F213293F61576618-3651 9-43152
502 EFI/MPI MCM0F80260000K99999918-3647 9-43157
502 MAG MPI0L017000UP18-3647 9-43157
575 GM0A6774290D76371618-3646 9-43151
575A677429UP18-3651 9-43152
8.2L MIE0D8572000F35027418-3647 9-43157
8.2L MIE0F3502750F81961918-3647 9-43157
8.2L MIE0D8572000F81961918-3647 9-43157
8.2L MPI/MIE0F819620UP18-3647 9-43157
888 FORD3108723UP18-3651 9-43152
888 FORD MCM3108723488782918-3646 9-43151
898/198 GM4762210621846118-3651 9-43152
898/198 GM MCM/MIE4762210621846118-3646 9-43151
898 GM6218462UP18-3668 9-43150

Engine / Model

Beginning S/N

Ending S/N

Sierra Thermostat Kit

Mallory Thermostat Kit

Notes:
(2) : Cast Iron
(3) : Old Design
(4) : New Design
(5) : Std. Cooling
(6) : Closed Cooling
(8) : S/N 6229718 & up
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Mercury Marine 99155T1 replacement parts

Thermostat Kit - Sierra
Sale Price: $15.99
Save: $3.00
(15% Off $18.99)
Part # 18-3568
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Part # 18-3568
Replaces OEM part #
  • MERCURY MARINE 99155T1
Fits:
  • Model 5.7MIE, Year 1998-2001, Serial# OL002003 & Up
  • Model MX6.2LMPI, Year 2000-2001, Serial# OL680003 & Up
  • Model 454 Horizon MIE, Year 1998-2001, Serial# OL002200 & Up
  • Model 502 Mag. MPI, Year 1998-2001, Serial# OL017000 & Up
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $19.99
Save: $5.00
(20% Off $24.99)
Part # 18-3644


Part # 18-3644
Contains:
  • (1) 18-3649 Thermostat 160 Degree - replaces O.E.# 807252T2
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2917 Thermostat Cover Gasket - replaces O.E.# 27-53045-1
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GLM 13380 replacement parts

Thermostat Kit - Sierra
Sale Price: $17.99
Save: $3.50
(16% Off $21.49)
Part # 18-3646


Part # 18-3646
Replaces OEM part #
  • MERCURY MARINE 807252Q3
Contains:
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
  • (1) 18-2917 Thermostat Housing Gasket - replaces O.E.# 27-53045-1, 27-33918
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2834 Thermostat Cover Gasket - replaces O.E.# 27-60208
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $23.99
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(17% Off $28.99)
Part # 18-3647
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Part # 18-3647
Replaces OEM part #
  • MERCURY MARINE 807252Q5
Contains:
  • (1) 18-3649 Thermostat - replaces O.E.# 807252-2
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-2552 Thermostat Cover Gasket - replaces O.E.# 27-33179-2
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-7173 O-Ring - replaces O.E.# 25-30224
  • (1) 18-2917 Thermostat Housing Gasket - replaces O.E.# 27-53045-1, 27-33918
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $17.99
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Part # 18-3648
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Part # 18-3648
160 Degree
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $17.99
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(18% Off $21.99)
Part # 18-3650


Part # 18-3650
Contains:
  • (1) 18-2831 Gasket - replaces O.E.# 27-47590-1
  • (1) 18-3550 Thermostat - replaces O.E.# 59078
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $15.99
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(20% Off $19.99)
Part # 18-3651
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Part # 18-3651
Contains:
  • (1) 18-2554 Thermostat Cover Gasket - replaces O.E.# 27-90556
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2834 Thermostat Cover Gasket - replaces O.E.# 27-60208
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
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GLM 13400 replacement parts

Thermostat Kit - Sierra
Sale Price: $18.99
Save: $5.00
(20% Off $23.99)
Part # 18-3652
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Part # 18-3652
Contains:
  • (1) 18-2555 Thermostat Cover Gasket - replaces O.E.# 27-89656-1
  • (1) 18-2843 Thermostat Cover Gasket - replaces O.E.# 27-74830
  • (1) 18-3552 Thermostat - replaces O.E.# 76270
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GLM 13420 replacement parts

Thermostat Kit - Sierra
Sale Price: $18.99
Save: $4.00
(17% Off $22.99)
Part # 18-3667


Part # 18-3667
Contains
  • (1) 18-2555 Thermostat Cover Gasket - replaces O.E.# 27-89656-1
  • (1) 18-3555 Thermostat - replaces O.E.# 99155A1
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Mercury Marine 807252T4 replacement parts

Thermostat Kit - Sierra
Sale Price: $14.99
Save: $3.50
(18% Off $18.49)
Part # 18-3668


Part # 18-3668
Contains:
  • (1) 18-2552 Thermostat Cover Gasket - replaces O.E.# 27-33179-2
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2554 Thermostat Cover Gasket - replaces O.E.# 27-41812
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
  • (1) 18-7173 O-Ring - replaces O.E.# 25-30224
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $16.99 (Out of stock)
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(20% Off $21.49)
Part # 18-3668D
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Part # 18-3668D
Contains:
  • (1) 18-2552 Thermostat Cover Gasket - replaces O.E.# 27-33179-2
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2554 Thermostat Cover Gasket - replaces O.E.# 27-41812
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
  • (1) 18-7173 O-Ring - replaces O.E.# 25-30224
 
Mallory Thermostat Kit 9-43157

Mallory Thermostat Kit 9-43157*
Sale Price: $21.59
Save: $6.40
(22% Off $27.99)
Part # 9-43157


Replaces GLM #:13101
Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):807252Q5
Fits Application:1987 & newer GM engines w/160 t-stat & standard cooling
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Mallory Thermostat Kit (140) 9-43153

Mallory Thermostat Kit (140) 9-43153*
Sale Price: $15.29
Save: $4.40
(22% Off $19.69)
Part # 9-43153
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Replaces GLM #:13370
Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):27-47590 1+ 59078
Fits Application:Gm inline 4 & 6 cyl.
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Mallory Thermostat Kit 9-43152

Mallory Thermostat Kit 9-43152*
Sale Price: $14.39
Save: $5.60
(28% Off $19.99)
Part # 9-43152
Hurry! Only 1 left in stock
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Replaces GLM #:13380
Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):27-90556+27-47510+27-60208+27-48818-1+59137
Fits Application:3.7L 4 cyl.
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Mallory Thermostat Kit 9-43151

Mallory Thermostat Kit 9-43151*
Sale Price: $16.19
Save: $3.80
(19% Off $19.99)
Part # 9-43151
Hurry! Only 1 left in stock
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):807252Q3
Fits Application:1982&older Ford/GM eng. w/std cooling/1996&older hi-perf. w/clsd cooling
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Mallory Thermostat Kit 9-43150

Mallory Thermostat Kit 9-43150*
Sale Price: $14.39
Save: $4.10
(22% Off $18.49)
Part # 9-43150
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Replaces GLM #:13390
Replaces Original Equipment Manufacturer(OEM):Mercruiser
Fits Application:Many w/old design housing and 142* t-stat
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Mallory Thermostat Kit 9-43100

Mallory Thermostat Kit 9-43100*
Sale Price: $16.19
Save: $5.30
(24% Off $21.49)
Part # 9-43100
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):N/A
Fits Application:18-2917, 18-2553, 18-3649
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Mallory Thermostat Kit (140) 9-43020

Mallory Thermostat (140) 9-43020*
Sale Price: $14.39
Save: $4.60
(24% Off $18.99)
Part # 9-43020


Replaces Original Equipment Manufacturer(OEM):MERCRUISER
Replaces Original Equipment Manufacturer # (OEM #):27-47590 1+59078
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $18.99 (Out of stock)
Save: $4.00
(17% Off $22.99)
Part # 18-3646D
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Part # 18-3646D
Replaces OEM part #
  • MERCURY MARINE 807252Q3
Contains:
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
  • (1) 18-2917 Thermostat Housing Gasket - replaces O.E.# 27-53045-1, 27-33918
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2834 Thermostat Cover Gasket - replaces O.E.# 27-60208
 
Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $26.99
Save: $5.00
(15% Off $31.99)
Part # 18-3647D
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Part # 18-3647D
Replaces OEM part #
  • MERCURY MARINE 807252Q5
Contains:
  • (1) 18-3649 Thermostat - replaces O.E.# 807252-2
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-2552 Thermostat Cover Gasket - replaces O.E.# 27-33179-2
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-7173 O-Ring - replaces O.E.# 25-30224
  • (1) 18-2917 Thermostat Housing Gasket - replaces O.E.# 27-53045-1, 27-33918
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Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $19.99 (Out of stock)
Save: $5.00
(20% Off $24.99)
Part # 18-3648D
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Part # 18-3648D
160 Degree
 
Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $19.99 (Out of stock)
Save: $3.00
(13% Off $22.99)
Part # 18-3650D
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Part # 18-3650D
Contains:
  • (1) 18-2831 Gasket - replaces O.E.# 27-47590-1
  • (1) 18-3550 Thermostat - replaces O.E.# 59078
 
Thermostat Kit - Sierra

Thermostat Kit - Sierra
Sale Price: $17.99
Save: $4.00
(18% Off $21.99)
Part # 18-3651D
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Part # 18-3651D
Contains:
  • (1) 18-2554 Thermostat Cover Gasket - replaces O.E.# 27-90556
  • (1) 18-2553 Thermostat Cover Gasket - replaces O.E.# 27-47510
  • (1) 18-2834 Thermostat Cover Gasket - replaces O.E.# 27-60208
  • (1) 18-2844 Thermostat Cover Gasket - replaces O.E.# 27-48818-1
  • (1) 18-3551 Thermostat - replaces O.E.# 59137
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Sierra

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Average Customer Review for Thermostat Kit - Sierra
Based On 1 Review
Looks to be good quality by Dwayne - Thunder Bay, OntarioOctober 15, 2011
Installed this product and looks to be good quality.
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Average Customer Review for Thermostat Kit - Sierra
Based On 1 Review
T-stat Review by Robert - Louisville, KentuckyAugust 15, 2011
Although this "kit" came with the gasket it didn't come with the retainer that's needed to hold it in place.
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Average Customer Review for Thermostat Kit - Sierra
Based On 2 Reviews
Great item and price. by Douglas - Derry, New HampshireSeptember 08, 2012
I am pleased with the overall product quality, price, and speed of shipping.
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Average Customer Review for Thermostat Kit - Sierra
Based On 1 Review
Sierra thermostat kit by Rob - Grafton, North DakotaAugust 16, 2011
iboats has a very competitve price and ordering was easy and efficient. They sent the correct product and it installed and worked flawlessly.
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Average Customer Review for Thermostat Kit - Sierra
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Mercruiser stat kit by William - Mahopac, New YorkJanuary 06, 2013
As described and price is good
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Average Customer Review for Mallory Thermostat Kit 9-43157
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Easy find by Samara - New Cumberland, West VirginiaMay 21, 2013
Great price and exact fit #128515
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No Review for Mallory Thermostat Kit (140) 9-43153
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Average Customer Review for Mallory Thermostat (140) 9-43020
Based On 2 Reviews
ITEM SHOWN NOT THE ITEM RECIEVED by Ron - EL Cajon, CaliforniaOctober 15, 2010
Thermo kit shows gasket.Package came as thermostat only.Called i-boat.Was told it would be a long hold and they would call back.No call back came.Now its Friday night and have no chance for callback before Monday.Project put on hold.Now its one more missed weekend of boating.Still not sure why its called a thermostat kit when no gasket is included as shown
(2 of 2 people found this review helpful)
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