CAPO71,

You have it now... It's just a shorter belt... Not sure of your application but I can pull one of the spares out of the truck and let you know the length... It's the alternator belt unless this is the last thing to go...

Karl

PS... If you have a singel the one listed above will do the job including the thermostat bypass to wet the headers...

Thunder1,

would that (above) setup work with a 174 B&M ??

hi-perf-2000,

Yep... I have them on 525-SC's and have also used the same
bypass on the a 174 blower with an "automotive replacement
intake"... That would be the $300 vs. the $1500 version replacement... Go for it...

Karl

hi-perf-2000,

Sorry, I forgot to mention that re-plumbing the headers is something that may have to be done depending on whether
you have stock Mercruiser/Gil application or otherwise... It eliminates the need for two hoses, which came from the old
thermostat housing, and using a singular hose down to the header water inlet...

Karl

I am running stainless marine exhuast...so i should already be plummed correctly.

Are you saying that i need a different "automotive" intake manifold to adapt the themostat housing???

hi-perf-2000,

Nope... It will work fine for you... What I meant is that if an intake for the blower fails, that would be a water leak from corosion, that the much cheaper auto intake will also work with the bypass shown in this thread... The difference is that they place the thermostat opening in the casting directly under the blower drive snout and the above replacement (Stainless) is the only one that will work... Hope I am a bit clearer this time...

Tnx, Karl

I think i get it now. The intake i am using does have the thermostat directly under the snout.......and there is an "adapter" type housing that directs it over about 6 inches and then up (to clear the snout).


I've seen many crossovers on N/A motors, but never seen the "pressure relief" as the one pictured above?? What does this do, and what hose gets connected to it??

Mark

Mark,

Relief Valve... I have not seen one built in from the manufacturer but this one has it... The functionality is that the sea pump, depending upon restriction of the engine, coolers and exhaust, will build upwards of 30 lbs. of pressure in the system... It is not desirable to hold this amount of water pressure in the cooling system and this is a good method to eliminate the problem... I would imagine that it would trigger somewhere between 10-15
lbs. but this would depend on the product... The hoses attached would have to vent to the outside of the boat or parallel to the
header intake or output... Transom exit would seem the cleanest...

Karl

CAP071: You probably have the newer serpentine belt set-up (if its a Mag MPI you do). I tried last year to find a cross-over kit but nobody made one. It would need to have an idler pulley to route the belt correctly. I ended up buuing a new circ pump (have been through two on my '99 so far) BAM has a good price on the merc units. My original merc and an aftermarket have failed on me and now I'm on a Merc unit from BAM. One year and so far so good...