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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11073
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Does a 1998 7.4 liter mpi mercrusier engine have 4-bolt main

Customer Question

Does a 1998 7.4 liter mpi mercrusier engine have 4-bolt main bearing caps.
What should the oil pressure range be?
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello Allan. My name is Tan.

The specs from the manual are minimum oil pressure @2000 rpms 30 psi. Min oil pressure @ idle 4 psi.

So it is quite a wide range. At full throttle it can go as high as 80 psi. There is no max spec.

What seems to be the issue?

Customer: replied 1 year ago.
Also need to know it that engine has 4 Bolt main bearing caps . No issue just wanted info. Thanks
Expert:  Tan replied 1 year ago.

These engines are 2 bolt Hi performance passenger car engines. That have been marinized for marine application.

Customer: replied 1 year ago.
Any known issues with this engine
Expert:  Tan replied 1 year ago.

None this is a very good engine. The only issues I have ever had with these motors and this goes along with all marine engine is water intrusion from the exhaust manifolds and risers.

Customer: replied 1 year ago.
Your answer is not correct , per Mercruiser all Gen. Vl engines 1998-2004 are 4- bolt mains !
Expert:  Tan replied 1 year ago.

Sorry they used to be all 2 bolt.