Mercruiser Thermostat Housings

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Engine / Model

Beginning S/N

Ending S/N

Sierra Thermostat Housing

Mallory Thermostat Housing

185 (229 CID)6330183691965518-1994(9) 9-42502
185 (262 CID)A331455B52795418-1994(9) 9-42502
200 GM6218462B52598118-1994(9) 9-42502
200/5.0L GM(3)B525982UP18-1994(9) 9-42502
200/5.0L GM(4)B525982UP18-1994(9) 9-42502
205 (262 CID)A331455B52795418-1994(9) 9-42502
205/4.3L, 4.3LX (262 CID)(3)B527955D71436918-1994(9) 9-42502
228 GM4765100621846118-1993 -
228 GM6218462B52598118-1994(9) 9-42502
230 GM6218462B52598118-1994(9) 9-42502
230/5.0L-LX GM(3)B525982F60099918-1994(9) 9-42502
230/5.0L-LX GMB525982F60099918-1994(9) 9-42502
250 GM4768000490884918-1993 -
255 GM4175500476799918-1993 -
260 GM6218462B52598118-1994(9) 9-42502
260/5.7L GM(3)B525982F60099918-1994(9) 9-42502
350 MagB525982F60099918-1994(9) 9-42502
5.7 GM (SKI)A338553B51462618-1994(9) 9-42502
280 GM TRS4176250477019918-1993 -
300 MR/TRS GM6668677B43036718-1994(9) 9-42502
500(Gen V)F213293F61576618-1994(9) 9-42502

Engine / Model

Beginning S/N

Ending S/N

Sierra Thermostat Housing

Mallory Thermostat Housing

Notes:
(3) : Old Design
(4) : New Design
(9) : For stainless steel version use 18-1989
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Engine / Model

Thermostat Housing Kit - Sierra
Your Price: $101.99
Save: $27.40
(21% Off $129.39)
Part # 18-1910 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 861493A3
Fits: 3.0L GM 181 L/4 (1999-Up)
Thermostat Housing - Sierra
Your Price: $40.99
Save: $29.04
(41% Off $70.03)
Part # 18-1977-1 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 47441A1
Fits: 225, GM 260, 228, 898/198, 185R, 898R, 228R, 2GR, 350 Mag
Thermostat Housing, Stainless Steel - Sierra
Your Price: $205.99
Save: $52.72
(20% Off $258.71)
Part # 18-1989 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 860256A4
  • MERCURY MARINE 861006A
  • MERCURY MARINE 87290A4
(Use 18-1989K Thermostat Service Kit for replacement parts)
18-1989K Thermostat Service Kit - Sierra
Your Price: $10.97
Save: $2.02
(15% Off $12.99)
Part # 18-1989K ValueShip™ Eligible
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Service Kit for 18-1989 Thermostat Housing
Thermostat Housing for Mercruiser 78984A1, GLM 13530 - Sierra
Your Price: $245.99
Save: $18.01
(6% Off $264.00)
Part # 18-1993 ValueShip™ Eligible
Hurry! Only 1 left in stock
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Replaces OEM part #
  • MERCURY MARINE 78984A1
Thermostat Housing - Sierra
Your Price: $157.99
Save: $30.19
(16% Off $188.18)
Part # 18-1994 ValueShip™ Eligible
Hurry! Only 1 left in stock
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Replaces OEM part #
  • MERCURY MARINE 87290A4
For: Stainless Steel Version use 18-1989
Thermostat Housing for Mercruiser 861188A1, GLM 13540 - Sierra
Your Price: $302.99
Save: $64.36
(17% Off $367.35)
Part # 18-3531 ValueShip™ Eligible
Hurry! Only 1 left in stock
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Replaces OEM part #
  • MERCURY MARINE 861188A1
Fits: MCM/MIE GM V-6 & V-8 305, 350, 454 & 502 cid engines with closed cooling systems
Thermostat Housing & Cover - Sierra
Your Price: $196.99
Save: $47.01
(19% Off $244.00)
Part # 18-3532 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 55331A5
Fits: MCM/MIE GM V6 & V8, 305, 350, 454, and 502cid, engines with closed cooling
Mallory Thermostat Housing 9-42502
Mallory Thermostat Housing 9-42502
Your Price: $160.99
Save: $27.19
(14% Off $188.18)
Part # 9-42502 ValueShip™ Eligible
Hurry! Only 1 left in stock
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Replaces GLM #:N/A
Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):87290A4
Fits Application:MCM/MIE GM V6-V8 (305,350,454,502 & 504 cid) early design
Mallory Thermostat Housing 9-42501
Mallory Thermostat Housing 9-42501
Your Price: $302.99
Save: $64.36
(17% Off $367.35)
Part # 9-42501 ValueShip™ Eligible
Hurry! Only 1 left in stock
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):861188A1
Fits Application:MCM/MIE GM V6-V8 (305,350,454,& 502) w/ closed cooling
Mallory Thermostat Housing 9-42505
Mallory Thermostat Housing 9-42505
Your Price: $174.99
Save: $28.65
(14% Off $203.64)
Part # 9-42505 ValueShip™ Eligible
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):90736A18
Fits Application:MCM/MIE 185 (229 cid) 330, 340, 7.4L, 454 Mag, 370, 425 & 465
Mercury Marine 47442 A1 replacement parts
Mallory Thermostat Housing 9-42503
Your Price: $48.99
Save: $7.26
(12% Off $56.25)
Part # 9-42503 ValueShip™ Eligible
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):47442A1
Fits Application:MCM/MIE GM V6-V8 (454 & 502cid) & Hi Perf. 454/482 cid (Off-set Bolt pattern)
Thermostat Housing
Your Price: $349.13
Save: $68.37
(16% Off $417.50)
Part # 18-3530-1 ValueShip™ Eligible
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  • Replaces: 860256A4
  • For: GM V6 and V8 (305 & 350 ci)
Chrysler Elbow - H20 Manifolds
Your Price: $103.49 (Out of stock)
Part # T-20913 ValueShip™ Eligible
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Replaces:
  • Chrysler #'s 2469639 and 2847405
Mercruiser Elbow - H20 Manifolds
Your Price: $175.18
Part # T-20978 ValueShip™ Eligible
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Replaces:
  • Mercruiser #'s 76771 and 60427.
Sierra
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