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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?? |
There are a whole bunch of 454's in various years and configurations.
Need a motor serial number? |
It’s a 1988 bravo if that helps |
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 https://cimg3.ibsrv.net/gimg/www.off...c8e6e13f3f.png I would look at the man to riser gaskets first to see if there clogged up |
Yes that’s the one. I can blow the hoses pretty easy right at the thermostat and hear the water bubbling inside the manifold so it is getting a little |
If you have good flow from thermostat housing I would think rust scale in manifolds could be clogging flow. Maybe take them and acid dip them |
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. |
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