49M977-1036-G5 Shredding crankcase gaskets

[KE4AVB]

Sorry for taking so long but had other major to get done first. Here is examples of what I found today when I pull the oil sump pan.


Now I don't see a single reason for it be leaking.

[hanz63]

So where do you go from here? I get to see what another shop did by installing a Chineseum cam in a 33. Joy.

[KE4AVB]

Well I tried a couple of Chinese crap cams here had to machine them down to fit and then they didn't last a season.

I going to try Permatex Ultra Black on both sides of the gasket, install finger tight for 12 hrs then torque to specs. Motoseal didn't work. It turned rock hard.Maybe by the time it blows again I be out of here.

[hanz63]

The gasket is the weak part of the layering system you'll have. I'm thinking that your seal will hold half of the gasket to each side. Something for you to ponder. I've had these twins before and wonder why the gasket came apart as it did. Thinking that my straight edge was as good as a wooden rule or something.

[KE4AVB]

I checked the sump gasket thickness before I install it and it was .021" so doing a gasket delete is risky as you can't check the camshaft end play with the unit together.

[Arkie]

Just couple tips on them old Briggs dogs that I've used when doing a sump.
I usually try to check the crank end play before pulling the sump but if I have not and I wonder if I can eliminate the sump gasket I'll install the sump with only about 4 of the bolts and leave the bolts loose, then slowly snug up each sump bolt while turning the crank. If it start getting turning resistance I know I need a gasket/gaskets. If I get the bolts snug and it still turns freely I'll see if I have any crank end play, at least .002.
I've put few of them dogs together using Yamaha bond 4 and no gasket with good long term results. I prefer not using the paper gasket but if I have to I use the gasket I use Yamaha bond very sparingly on each side wiping a very thin coat on each side of the very cleaned aluminum with one finger so as to cement the thin and clean dry paper gasket in place and not excess squeezing of excess to the inside of the block. I seen what I think is a weal compression mating surface and as the gasket gets old/slick and thinner it just starts leaking. I had to take one apart sometimes back that I had done without the gasket using only Yamaha bond due to the wimpy compression release breaking and I had to carefully keep going around the sump with a rubber mallet to get the sump loose.
I prefer the Yamaha Bond for this sump area sealing instead of the weaker RTV.
The Yamaha Bond 4 is more expensive than the RTV, BUT I just store the unused tube portion a fridge and it lasts forever (will last over a year) for re-use later.