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manifolds and risers

 
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stephens13adoc



Joined: 01 Apr 2008
Posts: 2

PostPosted: Tue Apr 01, 2008 6:37 pm    Post subject: manifolds and risers Reply with quote

i just had my new, used boat surveyed. it has twin 8.1L 385 hp crusaders, one of the manifolds is 10-15 degrees hotter than the others, but within ok limits. the engines have 126 hrs on them and are 4 yrs. old. does anyone think this is a problem., or is it due to the fact it is the last in line to get the water from the cooling source ?
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boatScotty
Senior Member


Joined: 07 Nov 2006
Posts: 229
Location: Pacific Northwest

PostPosted: Wed Apr 02, 2008 9:08 am    Post subject: manifolds and risers temerature differences Reply with quote

Last in line for the water would easily account for that 10-15 degrees difference.

I would not worry about it... at all!

If they were more irregular, I would acid flush (I use Vinegar) the cooling system - it removes salts and buildup without damaging gaskets or cast iron.
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Boat Scotty

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stephens13adoc



Joined: 01 Apr 2008
Posts: 2

PostPosted: Wed Apr 02, 2008 4:04 pm    Post subject: Reply with quote

thanks scotty.
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MikeW
Senior Member


Joined: 01 May 2006
Posts: 680

PostPosted: Thu Apr 03, 2008 12:44 pm    Post subject: manifolds and risers temerature differences Reply with quote

Hello stephens13adoc, I doubt the problem is last in line for the water. There is not a big difference in temperature at this time but it could increase at high speeds. The most common problem is the water ports in the manifolds and risers can become restricted with rust. It's an easy operation to remove the risers and inspect the cooling ports. Often they only need to be cleaned and new gaskets installed.
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