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Rebuilt L20b Timing chain noise (by the oiler)


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#41 Stoffregen Motorsports

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Posted 29 August 2015 - 11:30 AM

Maybe....

 

Pull the dizzy out and grasp the top of the spindle with needle nose pliers and try turning it side to side. I imagine there is some play but if really loose maybe it's f'd up.

 

One last thing is the crank bolt tight?

That and/or the cam bolt. He says they are tight.

 

A rod bearing could be the noise. If you catch it in time, you could just polish the crank with some super fine emery cloth and put a new bearing in. You can do that without pulling the motor. If you didn't catch it in time............!



#42 Draker

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Posted 29 August 2015 - 11:56 AM

I'll check these. I'm out at the datslocos camp out at shasta so it will probably next weekend. I'll be sure to follow up with my findings. I'll get the videos posted also.

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#43 KoHeartsGPA

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Posted 07 September 2015 - 10:27 PM

Updates?

#44 Draker

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Posted 08 September 2015 - 08:00 AM

No updates. Taking a bit of time away from wrenching.

 

Here is the video from before Shasta. It sounds worse than this now.

 


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#45 banzai510(hainz)

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Posted 08 September 2015 - 08:14 AM

I would pull thr front cover and drop the oil pan slightly and look.

I think its the tensioner shoe worn or catching a edge of the chain guide
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#46 Stoffregen Motorsports

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Posted 08 September 2015 - 08:51 AM

I pulled the cover on a L motor once and found a screwdriver. Sounds just like that.



#47 KoHeartsGPA

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Posted 08 September 2015 - 10:17 AM

To me it unfortunately sounds like cylinder #1 or possibly #2 rod bearing, as the rpms go up so does the intensity of the knocking, I would drop the pan and take a good look at both, get a good grip on them and see if they move, also manually turn the motor to look for visual anomalies as the crank is turning.

I'm not sure what time and if I'll be home this coming weekend, but I'll be more than happy to come over and help you find/fix the problem, bud.

#48 Stoffregen Motorsports

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Posted 08 September 2015 - 11:50 AM

Doesn't sound like a rod bearing to me. The pitch and frequency are too high.

#49 KoHeartsGPA

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Posted 08 September 2015 - 11:59 AM

Doesn't sound like a rod bearing to me. The pitch and frequency are too high.


I factored that in since its a phone audio, the pitch is deceptive from my experience taking video of my engine running compared to live actual audio, but that's just my 2 cents, hopefully it's not something major.

#50 Draker

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Posted 08 September 2015 - 12:17 PM

It's not a rod bearing. It's the chain. Bearings would be reflected in the oil pressure. There would be fluctuations at the very least. The sound is coming from the front cover. It's easy to isolate. 


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#51 banzai510(hainz)

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Posted 08 September 2015 - 12:26 PM

It's easy to isolate.



Its EZ to take the front cover off.
Hard part is ripping the oil pan gasket front. But you cAN SPLICE ANOTHER IN IF IT TEARS
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#52 KoHeartsGPA

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Posted 08 September 2015 - 12:32 PM

The pan gasket is new, should be ok and survive the job.

#53 banzai510(hainz)

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Posted 08 September 2015 - 12:33 PM

Lower the pan and hope it dont tear
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#54 Doctor510

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Posted 08 September 2015 - 01:58 PM

The pan gasket is new, should be ok and survive the job.

IF it has not been super glued to the bock and front cover

 

 



#55 datzenmike

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Posted 08 September 2015 - 04:38 PM

Take the valve cover off and you have a direct shot to the sound.... if it is the chain.  You might even see what's causing it while it's running. If you have a spare valve cover cut the front off and install so the oil doesn't spray all over. Taking the chain cover off is too drastic right now and you won't see or hear it running.


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#56 Draker

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Posted 08 September 2015 - 05:49 PM

I did that already. While running.. everything looked fine. No obvious slop in the chain or guide.

Warning oil will go everywhere.

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#57 Draker

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Posted 08 September 2015 - 05:54 PM

When I fix it, I will likely just pull the motor. Put it on the stand and fix it. It takes less than 2 hours. I have had this motor in and out many times already. One more time won't hurt.

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#58 Doctor510

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Posted 08 September 2015 - 05:56 PM

Sounds like a loose or broken chain guide

 

Be sure to send pics or let us know what you find



#59 datzenmike

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Posted 08 September 2015 - 05:59 PM

Sounds like any L series to me.


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#60 banzai510(hainz)

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Posted 08 September 2015 - 06:19 PM

Sounds like any L series to me.

 

 

That's what I first thought also.But I think I heard a grinding

 

last time I had that my tensioner was out and cocked 45 deg upward thus wearing the bottom thin side of the shoe which was going to metal.

 

tother time the tight side guide I ran a longer screw in the stat housing thus pushing the guide over to much hitting the chain on the downward slope.


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