Mercruiser 454 Mag Reversion?
03-31-2024, 03:31 PM
#31
Registered
next time,take hoses that head to the exhaust off and let them dump.then check your oil.
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marko84 (04-01-2024)
04-01-2024, 01:34 AM
#32
i have now open gaskets between exhaust and risers. There is other choice too, restricted gaskets.
But i dont think that causes problem.
i mean, open gaskets maybe let more water flowing thru exhaust.
I have raw water cooled engine.
04-01-2024, 07:26 AM
#33
Registered
look for leaks betw, manifold and risers,,doesn't take much to get water sucked back.
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marko84 (04-01-2024)
04-01-2024, 09:48 AM
#34
Looks better now.
i run engine wirhout water in exhausts, oil level stays same.
Then i run engine normal with water in exhaust about 20minutes idling, engine is full warm, i used my silent choice y-pipes next to risers.
Now oil is about 5millimeters upper than when i start engine, thats not good but:
When i check oil filter oil looks better, there is still white but it looks more like oil now. Oil filter is only half full.
i think that oil is now so hot that it dripping easy back to oil pan.
I wait 3hours and when engine is almoust cold i crank oil pressures up without starting engine.
wait 15 minutes and check oil level and dipstick is same level than beginning.
My Clymer book says 27-34nm torque specs for riser gaskets. Everywhere else it is 41nm. I think they been loose and water is leaking there alltime. Now they are 41nm some little more. When engine is warm i torque those little more ...
i run engine wirhout water in exhausts, oil level stays same.
Then i run engine normal with water in exhaust about 20minutes idling, engine is full warm, i used my silent choice y-pipes next to risers.
Now oil is about 5millimeters upper than when i start engine, thats not good but:
When i check oil filter oil looks better, there is still white but it looks more like oil now. Oil filter is only half full.
i think that oil is now so hot that it dripping easy back to oil pan.
I wait 3hours and when engine is almoust cold i crank oil pressures up without starting engine.
wait 15 minutes and check oil level and dipstick is same level than beginning.
My Clymer book says 27-34nm torque specs for riser gaskets. Everywhere else it is 41nm. I think they been loose and water is leaking there alltime. Now they are 41nm some little more. When engine is warm i torque those little more ...
Last edited by marko84; 04-01-2024 at 10:02 AM.
04-01-2024, 12:40 PM
#35
Registered
Clymer is a terrible manual and may have errors, but torque is at least close. Merc manual list 34nm for riser to manifold
The exhaust gasket should be
https://www.mercruiserparts.com/863724-gasket
The exhaust gasket should be
https://www.mercruiserparts.com/863724-gasket
04-01-2024, 02:01 PM
#36
Clymer is a terrible manual and may have errors, but torque is at least close. Merc manual list 34nm for riser to manifold
The exhaust gasket should be
https://www.mercruiserparts.com/863724-gasket
The exhaust gasket should be
https://www.mercruiserparts.com/863724-gasket
04-01-2024, 02:05 PM
#37
Registered
The style I listed are better if you start having a over heat issue, the gaskets will help keep more water in the block
The issue you have now is not a heat issue, so I wouldn't worry about the difference. I don't see that gasket as being the issue right now
The issue you have now is not a heat issue, so I wouldn't worry about the difference. I don't see that gasket as being the issue right now
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marko84 (04-01-2024)
04-02-2024, 07:07 AM
#38
Registered
I'd worry that his gaskets are dumping alot of water.marko,do you remember what style exhaust riser gasket that came off?
04-02-2024, 07:14 AM
#39
Registered
Did you use thread sealer on the head bolts?
04-02-2024, 09:06 AM
#40
