MoPar Engines - Known for their Leaking problems?

[Carlwalski]

Is this true....I was talking to this guy at my local pub the other day and has was saying:
"Yeah, MoPar big block engines are renowned for leaking. Some drip, others pour. Just a fault with the engines sealing properly. Mostly big blocks." He was a knowledable guy too, he knew his cars.

I was like!?!  Not that I know or heard of but I haven't been around very long and no nothing about that kind of stuff...so i told him to shut up.  But, is it true? Lucy has a slight drip about a 50c piece area that is getting attention as we speak along with her buff polish etc But nothing major. It was like he was saying there is no sure fire way of keeping them sealed for ever. You can fix them but they may leak within a week........


Thanks,
NZ440R/T

[Killer_Mopar]

All engines have a weak spot for oil leaks, for mopars it is the rear main seal. The big block arent "known" for leaking, but most of the time if they leak that is where it comes from. I bought an Indy rear seal that is soppose to eliminate the leak, I will find out if it does when I get then engine built.

[Topcat]

Don't worry NZ. It's just that time of the month for Lucy.

[Carlwalski]

LMAO!! TC! 

Thanks Killer do let me know how you get on I may get one for Lucy. 

[Chryco Psycho]

not in my world

[dimples]

 

I bet it is leaking from the timing cover, huh?

[Chryco Psycho]

or the corners of cast valve covers

[Follicly Challenged]

HUH ?  AHHH BULL-DUNG !

He might know his vehicles, but he obviously doesn't know mopars.

The "Renowned for leaking" statement is strictly "Verbal Diarhea" and nothing more, Mopar Engines can be/are some of the best sealing engines around when done properly, and thats the key, even when using synthetic oils which are known to leak out where Dinosaur oil won't.

Tip; when re-installing your rear main seal, cut the seal retainer approx. .010" on a cap cutter to add a bit of crush to the seal. Also, "take a boo" at the seal as installed in the block to insure it's centered on the crank. Some blocks have the seal recess in the block machined slightly offset, which provides loose seal contact on one side.

If you find this problem, install the seal with the ends staggered across/over the parting line, and "drag" the seal over for better contact with the crank on the offending side when installing the retainer(bottom half).
Finally, use a good bead of silicon and a wet finger to seal the retainer at the rear of the block "all the way around", having brake-cleaned thoroughly first of course.

Renowned for leaking, MY ARSE ! oops ! that does leak occassionally !

[mrbill426]

All engines have a weak spot for oil leaks, for mopars it is the rear main seal. The big block arent "known" for leaking, but most of the time if they leak that is where it comes from. I bought an Indy rear seal that is soppose to eliminate the leak, I will find out if it does when I get then engine built.

So, is there "something" to those MP anti-leak rear main bearings I see for sale on e-Bay from time to time?  I only see them in standard form, are they available in undersize?

[Carlwalski]

Thanks for all the input guys, much appreciated. Good tips to for future reference...... 

[Skeletoil]

All my cars, read that Pars always leak at the tranny pan, I've straightened the bolt pattern surface and they still leak. The only cure I've found is a new tranny pan. The dude must be talkin about fords, they had huge valves and flowed real well, but kerbang, they were known as asphalt oilers. Their motors wouldn't stay together, oilin the asphalt.

[daves70]

Mine doesn't leak a drop. Engine or tranny pan. (440 & 727). Maybe I'm just lucky or the first day I get to put her in her new garage she'll spout like a guyser.