Rear main leak brand new X2!!

[3400-95-Modified]

GM 3100 overhaul procedures from my Beretta manual

INSTALLATION
Install upper main bearing in cylinder block. Ensure lock
tab is properly located in cylinder block. Install bearings in main
bearing caps. Ensure all oil passages are aligned. Install rear seal
(if removed).
Ensure crankshaft journals are clean. Lubricate upper main
bearings with clean engine oil. Carefully install crankshaft. Check
each main bearing clearance using Plastigage method. See
MAIN & CONNECTING ROD BEARING CLEARANCE in this article.
Once clearance is checked, lubricate lower main bearing and
journals. Install main bearing caps in original location. Install rear
seal in rear main bearing cap (if removed). Some rear main bearing
caps require sealant to be applied in corners to prevent oil leakage.
Install and tighten all bolts except thrust bearing cap to
specification. Tighten thrust bearing cap bolts finger tight only.
Thrust bearing must be aligned. On most applications, crankshaft
must be moved rearward then forward. Procedure may vary with
manufacturer. Thrust bearing cap is then tighten to specification.
Ensure crankshaft rotates freely. Crankshaft end play should be
checked. See CRANKSHAFT END PLAY in this article.

[ForcedFirebird]

Nope, that is true for 3400's too, I didn't put that RTV there on my first 3400 build and the motor had to come out on its 500 mile oil change to fix that problem. Needless to say the oil change took a little longer than 15 min.

And you put the spacer in the right spot, it goes on the outside of the flywheel its like a washer for the bolts.

Odd, usually one piece seals don't require silicone between the caps. I even dug out the manuals and they don't mention it.

I'll have to pull the pan/cap off the 3.4/3500 hybrid (still on the stand fortunately) and put a dab on there for security.

[3XTurboAgain]

there is really supposed to be silicone on a 1 piece? Im making the machine shop pay for this!! Should i tell them to use silicone on the rear main? I really have to take care of this. Last time they wanted me to drop my car at a transmission shop to take the tranny down to redo the engines rear main, i refused because i didnt want anyone touching my car so i took the engine back out... now i dont give a shit i just want it fixed and i dont feel like taking everything back out.... I put too much time and money into this car and i cant go to the track with a leaker.

[3400-95-Modified]

Nope, that is true for 3400's too, I didn't put that RTV there on my first 3400 build and the motor had to come out on its 500 mile oil change to fix that problem. Needless to say the oil change took a little longer than 15 min.

And you put the spacer in the right spot, it goes on the outside of the flywheel its like a washer for the bolts.

[ForcedFirebird]

There is supposed to be some RTV between the rear main cap and the block. If that is not there then you will leak from that area.

I alway thought that was on two-piece seal engines?

[gpse3400]

There is supposed to be some RTV between the rear main cap and the block. If that is not there then you will leak from that area.

[3XTurboAgain]

Had my motor rebuilt '90 3.1. Got it back and installed , leaked right from rear main area. Changed oil pan gasket, no luck, took motor back out and had machine shop redo their seal. Put motor back in and... still leaks from rear main seal ! Now my question, what did i do wrong? Is there a spacer inbetween the flywheel and crank or is it on the outside? I remember putting it on the outside of the flywheel... is that right and would that make the rear main seal leak? Trying to terminate this problem!! thanks!