Need some help 4.6 stroker

[blu3fan]

hey,
got a 92 4.6 stroker jeep.
the headgasket blew.
So I re-did the headgasket.
I did check for warping. There was none.
Started leaking same amount as before. Just a tiny little bit.
So I deduce head may be cracked.
Ive been struggling with a rear main seal leak for quite some time and the bearing is knocking.
good compression on all cylinders.

So at this point in time Im thinking I should just pull the whole motor when I replace the head. and get the crank reground while im at it.
Anything else I should take a look at ?
10-15k on the new motor.
I want to swap my cam. Im running the comp cams extreme. and its a pig. so may do that while im in there.

Re-conditioned heads are around $300
I feel like any machine work or even magnaflux is gonna cost me more than that.

Think its smart to just swap a new head. pull crank, regrind, put new bearings in ?

[Russ Pottenger]

If you have an engine noise, at a minimum you should pull the engine out and inspect.

[blu3fan]

Yeah. Actually I already know its just the rear main seal bearing.
After I Changed the rear main seal the I noticed the hairline scratch on it. (this was almost a year and a half ago)
When I assembled the engine it was done over 3-4 years. and For some reason I only put half the rear main seal in. and thus leaked and ruined the bearing.
So guessing im gonna need a crank re-grind. and new bearings.

[SilverXJ]

A knock would not happen from a hairline scratch. Nor should it be a problem. Missing part of the RMS would have not hurt the bearing.

[Russ Pottenger]

In your post you mentioned that your engine was down on power.
What is your static and cranking compression?
What is the part number of Comp cam you're currently running?

[blu3fan]

A knock would not happen from a hairline scratch. Nor should it be a problem. Missing part of the RMS would have not hurt the bearing.

Silver xj over a year of driving a motor. leaking oil out that gap. im convinced it ran dry and left the bearing to grind.
The only reason im convinced its that bearing.
When I rebuild the engine for the first time (pre stroker)
the rear main seal went before.
and the damage was one bearing with a hairline scratch.
nothing else was wrong, and that motor was knocking like no other. So I do believe a hairline scratch can cause knocking.

In your post you mentioned that your engine was down on power.
What is your static and cranking compression?
What is the part number of Comp cam you're currently running?

engine is far from down on power. in fact shes running awesome. aside from the knock. that I can only hear at idle when she is cold. after heating up can barely hear the knock/ping.
I did compression test and pulled around 160 from each cylinder.
the comp cams is one of the extreme kits.
http://www.summitracing.com/search/prod ... /make/jeep
I will have to pull my info to figure out which one.
I have a mopar valvetrain and yella terra 1.6 roller rockers.
Scat crank.
Im running the comp cams lifters. but I want to upgrade to crower lifters if I upgrade the cam to a crower cam.

[SilverXJ]

Silver xj over a year of driving a motor. leaking oil out that gap. im convinced it ran dry and left the bearing to grind.

The RMS does not control oil pressure to the rear bearing. The RMS isn't designed to hold any pressure except the crank case pressure from blow by. It did not damage your bearing. A hairline scratch will not cause a knock.

[blu3fan]

It was hairline when I Pulled it before. Who knows how bad it is now.
Are you sure silver xj ? I know your advise is usually advise to take, but Im skeptical this time.
Same knock sound as when I originally rebuilt it. same issue seems to have caused it from my point of view.
If its not a bearing from the rear knocking. what else would be ?
with the stethoscope it sounds like its exactly on that bearing. and yes I do know the bellhousing could make it sound weird or not where it seems

[blu3fan]

K68-231-4 is the cam.
http://www.summitracing.com/parts/CCA-K68-231-4/

springs and retainers
Mopar Performance spings P5249464 with Mopar Performance retainers P4452032

stock pushrods.

arp head bolts.

[Russ Pottenger]

If you pull your engine inspect and measure, you should be able to find the answers to your questions.