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Crowley Marine: serving boaters for over 40 years Crowley Marine: serving boaters for over 40 years
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Mercury/Mariner Powerhead Identification

In order to provide you with the correct powerhead, the following information is required:

1. Model Number and Serial Number
These numbers are located on the transom bracket of the motor.

2. Engine Cast Number

3 CYL of L# Powerheads: Please provide the cast number for 70, 75, 80, and 90 HP powerheads built between 1987 and 2002. This number is located on the starboard side of the block next to the number 3 CYL. Example: 877 - 8946 - C7

6 CYL, V6 or 3.0 litre Powerheads: Please provide cubic inch (122, 142, or 153) or litre (2.4, 2.5, 3.0). Also provide the cast number. This number located on the starboard side of the block where the two halves of the block come together. Example: 885 - 9811 - C4

Mercury/Mariner Serial Numbers...To Year Models


MYP4F10R - Mercury 4-Cylinder 4-Stroke 40-115HP 1999-2014
MYP301R - Mercury/Mariner 3-Cylinder "Baby L3" 40-60HP 1998-2008
MYP309R - Mercury/Mariner 3-Cylinder L3 70-90HP 1987-2010
MYP403R - Mercury/Mariner 4-Cylinder "L4" 100-125HP 1988-2005
MYP605R - Mercury/Mariner V6 2.0L 135-150HP 1991-2001
MYP616R - Mercury/Mariner V6 2.5L Carb & EFI 150-200HP 1991-2010
MYP607R - Mercury/Mariner V6 2.5L DFI (Optimax) 135-175HP 1998-2014
MYP634MR - Mercury/Mariner V6 2.5L ProMax 200-225HP 1994-2002
MYP635JR - Mercury/Mariner V6 2.5L Sport Jet 175-240HP 1997-2006
MYP637R - Mercury/Mariner V6 3.0L Carb & EFI 200-250HP 1994-2008
MYP670R - Mercury/Mariner V6 3.0L Pro XS 225-250HP 2004-2014
MYP6F20R - Mercury/Mariner V6 4-Stroke 225HP 2004-Current

Flat $3.95 Shipping on ALL parts orders

We offer shipping flat $3.95 shipping on ALL parts orders. (Complete Engines, Lower Units and Sterndrives excluded). In addition orders over $89 have reduced cost express shipping available in checkout.

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You can get a rough idea of standard transit times from the map above.

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