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-   -   454 rear main leak (https://www.offshoreonly.com/forums/do-yourself-boating-budget/362292-454-rear-main-leak.html)

rspillman88 08-06-2019 05:30 PM
454 rear main leak
 
Hello so I have a 454 in a 98 commander. Just got the boat and apparently the motor was redone 10 hours ago. It is very clean however I cant find the serial number to the engine so I'm not sure which 454 was put in it. Pretty sure it's a gen VI block because it has the mech fuel pump boss that's blocked off by teague with electric fuel pump. I have a leak at the rear and after filming a video its dripping off the oil pan flange at the rear main seal.

Gonna have a shop on monday pull the motor but is there anything else I should have them check while the motor is out? Also, why would the rear main go if the engine truly only had 10 hours on it? Is it the oil pan leaking at the seal?

beaver 3 08-06-2019 05:34 PM
it probably leaked from first start. it may be an older 2 piece seal block which are harder to get installed than the one piece. ten hours isnt that long of a time.

rspillman88 08-06-2019 05:44 PM
Originally Posted by beaver 3 (Post 4700711)
it probably leaked from first start. it may be an older 2 piece seal block which are harder to get installed than the one piece. ten hours isnt that long of a time.
okay makes sense yeah I do believe it's a 6th gen block which should be one peice?

rspillman88 08-06-2019 05:56 PM
Any items they should absolutely check while the engine is out?

ph1971 08-06-2019 06:04 PM
Don’t rule out the oil pan gasket. I had a very expensive gasket completely disintegrate after about 15 hours. Leaked right at the back at wot.

sailtexas186548 08-06-2019 09:05 PM
Check you valve covers they can leak down the back of the block and look like a rear seal leak.

rspillman88 08-07-2019 09:03 AM
Its definitely dripping off the oil pan right at the rear main

F-2 Speedy 08-07-2019 09:18 AM
There are 3 oil passages with pipe plugs around the rear cam journal area and also one in the rear of the block below the distributor, something to check.

rspillman88 08-07-2019 09:22 AM
Thank you I will take a look at it

rspillman88 08-07-2019 09:23 AM
Originally Posted by F-2 Speedy (Post 4700835)
There are 3 oil passages with pipe plugs around the rear cam journal area and also one in the rear of the block below the distributor, something to check.
could one of those make it drip from the flange where the oil pan meets the rear main cap?

rspillman88 08-07-2019 09:25 AM
Originally Posted by F-2 Speedy (Post 4700835)
There are 3 oil passages with pipe plugs around the rear cam journal area and also one in the rear of the block below the distributor, something to check.
https://cimg6.ibsrv.net/gimg/www.off...7b7549cb65.jpg
https://cimg7.ibsrv.net/gimg/www.off...a29bafef5c.jpg

sailtexas186548 08-07-2019 12:19 PM
Originally Posted by rspillman88 (Post 4700827)
Its definitely dripping off the oil pan right at the rear main
its amazing how a tiny stream of oil can go unnoticed and makes its way all the way to the pan and drip, especially when it is hot. i saw similar drips a few months back and was convinced it was rear main seal, but it was valve covers.

I would definitely reseal (or tighten the bolts) on the valve covers and clean it all really well before any more major surgery.

rspillman88 08-07-2019 12:52 PM
Originally Posted by sailtexas186548 (Post 4700883)
its amazing how a tiny stream of oil can go unnoticed and makes its way all the way to the pan and drip, especially when it is hot. i saw similar drips a few months back and was convinced it was rear main seal, but it was valve covers.

I would definitely reseal (or tighten the bolts) on the valve covers and clean it all really well before any more major surgery.
okay so I looked really well behind the valve covers and they are clean down to the block. The whole top half back of the motor is clean and dry not even so much as dust on it

ph1971 08-07-2019 04:08 PM
Might be the oilpan gasket in the corners where the cap meets the block. That spot is a typical suspect if the ultra grey gob wasn’t big enough. Or like I eluded to in the previous post, Felpro’s fancy reinforced one piece gasket turned into a crumbled mess in no more than 15 hours recently. I have used this gasket before with no problems so I have to guess that it was a composition problem in the rubber. Don’t know what gasket is in your application. Unfortunately the only cure is pulling the pan off.

rspillman88 08-07-2019 08:16 PM
Originally Posted by ph1971 (Post 4700934)
Might be the oilpan gasket in the corners where the cap meets the block. That spot is a typical suspect if the ultra grey gob wasn’t big enough. Or like I eluded to in the previous post, Felpro’s fancy reinforced one piece gasket turned into a crumbled mess in no more than 15 hours recently. I have used this gasket before with no problems so I have to guess that it was a composition problem in the rubber. Don’t know what gasket is in your application. Unfortunately the only cure is pulling the pan off.
That's the spot I'm thinking as well. Oh well I dont have time to mess with it so into the shop it goes

oconnor marine 08-08-2019 10:21 AM
The brass fitting that screws into the oil pan drain hole is tight and has a sealing washer on it right?


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