No water to exhaust manifolds?
06-18-2019 | 03:54 PM
#1
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No water to exhaust manifolds?
im running a mercruiser 454 with stock exhaust the riser runs nice and cool getting lots of water but the manifolds themselves are running 170-200 I’ve changed impeller and thermostat. I’ve cracked the lines running to the bottom of the manifolds and there is very little water running through them??
06-18-2019 | 08:23 PM
#4
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From: KY
The 88 does help a bit
Being a 88 with a bravo drive, and mans are hotter then elbows (risers) I'm guessing your cooling system looks like this on the left, same as small block
I would look at the man to riser gaskets first to see if there clogged up
Being a 88 with a bravo drive, and mans are hotter then elbows (risers) I'm guessing your cooling system looks like this on the left, same as small block
I would look at the man to riser gaskets first to see if there clogged up
06-18-2019 | 11:19 PM
#7
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Looking at the fluid schematic prev posted, the manifold hoses don't really flow until the thermostat opens, then you get hot (~150 deg) water to the manifolds. Did you check flow to manifolds with eng warmed-up (thermostat open)?
You can buy some reinforced clear hose and temporarily install it just to watch water flow. Safer then pulling off a hose with hot water flowing.
You can buy some reinforced clear hose and temporarily install it just to watch water flow. Safer then pulling off a hose with hot water flowing.
