Help with serpentine belt part number on Mercruiser 4.3L

[lou23]

I need a new serpentine belt for a Mercruiser 4.3L. The info I have is S/N OM346613 Model# 4211025PS and it has a description of 4.3L Alpha/Bravo 262 cid GEN+
I believe the part is 57-865615Q03 but I’m trying to verify that before I order one.
Thanks

 

[Bt Doctur]

If its not broken remove it and size it at a auto parts shop, Not a marine belt just an ordinary Dayco

 

[Bt Doctur]

704 mm about $49

 

[achris]

If it looks like this...



Then it's a standard Gates belt, 6PK1930.

I need a new serpentine belt for a Mercruiser 4.3L. The info I have is S/N OM346613 Model# 4211025PS and it has a description of 4.3L Alpha/Bravo 262 cid GEN+
I believe the part is 57-865615Q03 but I’m trying to verify that before I order one.
Thanks

That part number is for a Bravo engine (with an engine mounted sea water pump), but your serial number comes up as an Alpha... (same as the one in the above photo)

 

[Fun Times]

Serpentine belt for a Mercruiser 4.3L. S/N 0M346613 Model# 4211025PS... I believe the part is 57-865615Q03 but I’m trying to verify that before I order one.

The Mercruiser part number that would fit your engine from factory would be 57-865615Q04 .

BELT, Serpentine (#57-865615Q04)
Comment: (Standard Cooling) (Alpha) (Power Steering)
Supersedes: 57-865615004, 57-863876 4

The exception would be if your engine was added a Mercruiser sea-water-pump mounted to the engine for say a closed cooling system using antifreeze or other means of cooling per se then your found part number ending in Q03 would be needed.

 

[Bt Doctur]

Serpentine Belt 57-865615Q03 76 Inches 1941 mm length Fits 2001 and newer MCM V-6 & V-8 (305, 350 & 377 cid) Alpha engines with closed cooling Bravo engines with standard cooling (S/N 0M320025 and above)