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Learning how to build Lotus Seven replicas...together!
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PostPosted: May 12, 2018, 10:20 am 
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Joined: July 18, 2012, 8:14 pm
Posts: 13
Miatav8,MstrASE,A&P,F wrote:
I guess you've seen these videos about the rear main "issue";

I think the cause is crankcase pressure build up due to poor ventilation and blowby. I don't know any engine design that requires a retainer to keep the rear main from being blown out. With a clear pcv valve and open breather (not epa approved) there should be no way an engine with decent ring seal could build up enough pressure to blow it out.
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I actually learned about the rear main issue from Pakisitani and Mexican forums.

I agree on the pressure build up coming from the PCV valve. The ventilator in the intake manifold is freeflow and the pcv valve comes out of the vale cover. However it is also accepted that the oil level should be kept below the F line on the dipstick.
That retaining system looks silly and I doubt it would actually work. At most I see it stopping the seal from coming out as far as mine did but I doubt it would stop it from leaking at least a little bit.

I did forget to mention that I replaced the PCV. It is the same off of a 2000 Hyundai Accent or a 2003 Kia Spectra. My friend has the Spectra and we compared them. The PCV on my engine was indeed sludged up. I thought about cleaning it out because my instinct is to fix rather than replace. But it is a $5 part and is in the replaceable category.


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