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View Full Version : FWC Merc 5.7 Half cooling system schematic



doug hess
02-17-2002, 11:32 AM
Does anyone know where I can get the schematic/diagram for the engine block only fresh water cooling setup for a 1991 Merc 5.7 L / GM 350. The Merc manuals have diagrams for either full block/manifold cooling or seawater

From the main thermostat housing both those systems use 4 hoses to the manifolds and risers which is also connected to engine block cooling. It is not obvious how the two systems are separated in a split system.

I would also be interested in comments on using Merc Alpha 1 I/O water pump for cooling water on block only system. Some claim it can be done, others it is marginal and some it is inadaquate and separate pump must be used.

Doug

Murphy
02-19-2002, 09:44 PM
Check out this link and see if it does you any good. Great schematics of most MerCruiser models.

http://216.37.204.201/mercruiser_oem/mercruiser.asp?Type=11&SubType=111

Murph

BigGrizzly
02-19-2002, 09:56 PM
have instaed many closed systems. I t can be done with the Alpha water pump. Infact merc did it themselves on the 470 which had a closed cooling system.

Randy

Cuda
02-19-2002, 10:38 PM
I sure hope a full system can be done with an Alpha drive, I just installed one. I am still looking for the diagram of the half system. I know I saw it somewhere. :confused:

MOP
09-26-2002, 09:29 PM
If you poke around Murph's link there are a few water diagrams, not all engines show them. Or go to the home page http://hlsm.com/ they have decent micro fische of most of what we play with.