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Rebuilt L20b Timing chain noise (by the oiler)


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#121 Draker

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Posted 11 April 2016 - 07:53 AM

I have a early valve cover and I notice w/o the gasket it would hit the cam tower. I assume with the gasket it might work but torq down it will be a close fit. maybe the vabration is going thru that. Its a Hail Mary on this but just to let you know.

 

bearings look fine.

 

I wont use syn oil myself

 

It made the noise with both covers.

 

 

At $8-$12 a liter fuck that. As I said before it does sound a lot like every L20B to me.

 

It's pretty pronounced. Not normal. I'm sure there are a lot of worn out motors that sound like this.. lol


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#122 KoHeartsGPA

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Posted 11 April 2016 - 12:13 PM

This is a bizarre case as all the moving parts from that engine have been checked thoroughly....any chance it could be the starter maybe the pinion gear isn't retracting fully?....long shot I know....but....

#123 Draker

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Posted 11 April 2016 - 12:22 PM

This is a bizarre case as all the moving parts from that engine have been checked thoroughly....any chance it could be the starter maybe the pinion gear isn't retracting fully?....long shot I know....but....

 

Naw, not the starter. It was used on my L16. No issues there.


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#124 Draker

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Posted 03 October 2017 - 12:59 PM

So we might have an update to this mystery.

 

I didn't scrap the motor because I wanted to know what the issue was. I was going to hold on to it until I needed to rebuilt it.

 

My buddy Dennis was looking for a L20 to rebuild so I sold it to him and explained it needed a rebuild to a mystery noise. I showed him the videos. He took it to the machinist to inspect and ultimately build.

 

His thoughts regarding the noise: He thought there might have been slop in the chain due to the wear in the oiler. But it was worn before, you can see it in the pictures I posted. His other theory is that there was RTV under the rear main cap. The FSM states to put RTV back there, just a bit. I may have put too much. The theory is that the RTV may have caused excessive clearance.

 

Hard to say because it's been so long, but I plasti-gauged everything and measured all clearances with a mic. 

 

It's weird because the noise was in the chain area, then it got worse.. 

 

 

 

Anyway, sounds like it's getting new pistons, work on the crank, decking the block.. etc. Will be back up and running again soon! Just not in my car... lol


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#125 datzenmike

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Posted 03 October 2017 - 04:55 PM

Not RTV. Is nowhere near the bearing cap. A couple of dabs where the oil pan gasket meets the cap


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#126 Draker

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Posted 04 October 2017 - 08:13 AM

Not RTV. Is nowhere near the bearing cap. A couple of dabs where the oil pan gasket meets the cap

 

 

http://www.nicoclub....ick-Up-1977.pdf - Page EM-21

 

Fig EM 79 Applying sealant Main bearing cap and cylinder block


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