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Rebuilt L20b Timing chain noise (by the oiler)


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#21 datzenmike

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Posted 27 August 2015 - 11:23 AM

I think the oil behind it is to act as a shock absorber and any leakage just lubes the chain.


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#22 Stoffregen Motorsports

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Posted 27 August 2015 - 11:47 AM

The pic shows a nicely set up geometry. Two things to look out for: 1 - there can be so much pressure that it squshes the chain into the tensioner. 2 - when the head is torqued down the tensioner pushes out a bit.

 

Daniel - If it looks like that, everything is hunky-dory, but if it doesn't, sometimes you need to slot the holes in the guides, especially the curved guide, to get it to line up right.

 

Draker - How much oil pressure do you have at idle? Do you have an external cam oiler/spray bar?



#23 bananahamuck

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Posted 27 August 2015 - 12:21 PM

Fuck to me that looks good

only other thing is a long bolt from the stat housing hitting the tight side guide pushing it in.

 

 

 

I seen this happen with one of those upper bolts before ,, can't remember what kinda sound it made,, or when it made it,,  but it did.. Although it seems like it did it right from the get-go not a few hundred miles down the road.

 

 

While this thing is stressing you out only days before it's big trip,,,,,,,,,you have to just remind yourself how nice that Shasta camping trip is going to be.. 


So somehow while i was driving back from Eaglerock swap meet i somehow caused YOU to post this,,,, do really think members on this site are that stupid to believe i caused it??

http://community.rat...un-for-a-while/

Yeah i guess you do,,

 

BTW ,,,, the first person to call you a pussy,,,, ya might wanna check out his ethnicity ,, cuz i don't think it's what you think it is there snowflakeboy

 


..........................I shall call it, narclops.

 

 

 


#24 Draker

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Posted 27 August 2015 - 12:55 PM

The pic shows a nicely set up geometry. Two things to look out for: 1 - there can be so much pressure that it squshes the chain into the tensioner. 2 - when the head is torqued down the tensioner pushes out a bit.

 

Daniel - If it looks like that, everything is hunky-dory, but if it doesn't, sometimes you need to slot the holes in the guides, especially the curved guide, to get it to line up right.

 

Draker - How much oil pressure do you have at idle? Do you have an external cam oiler/spray bar?

 

If I remember right, it was around 30lbs. But I don't remember if that was at temp. Diego might remember, he was there. The pressure was really good. No external oiler on the cam.

 

 

I seen this happen with one of those upper bolts before ,, can't remember what kinda sound it made,, or when it made it,,  but it did.. Although it seems like it did it right from the get-go not a few hundred miles down the road.

 

 

While this thing is stressing you out only days before it's big trip,,,,,,,,,you have to just remind yourself how nice that Shasta camping trip is going to be.. 

 

I'm not overly concerned, when the RPMs climb the sound goes away. I'll bring spare parts and tools and we are traveling as a pack. I'll see if I can get a good video of the sound posted. It's tough because all you really hear is wind noise down in the engine bay.


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#25 KoHeartsGPA

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Posted 27 August 2015 - 02:17 PM

Ya oil pressure was right there at the 30psi mark estimated water temp around 180℉, idle was between 800 and 900 range if I recall correctly...

#26 kelowg

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Posted 27 August 2015 - 05:18 PM

Was deck or head shaved? Had same issue,ran for yrs like that. Adj idle up to 950-1000rpm,so it did make much noise that way. I ck mine tho timing cover opening. So i could see what was goin on at all rpms(no oil mess). Chain would flop around at certain rpms.



#27 banzai510(hainz)

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Posted 27 August 2015 - 07:05 PM

makes a grinding sound catching the top of the tight side guide


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#28 Draker

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Posted 27 August 2015 - 11:24 PM

I'm not sure what is causing the sound. I just got home from Al's place. Noise seems noticilbly louder after 30 miles. Looks like the dime will be not be making the trip. Time to pull the engine and check it out. Also the intake leaks coolant... fuck.

I got pics and video of the noise from earlier. Not after the drive...

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#29 banzai510(hainz)

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Posted 28 August 2015 - 05:05 AM

no need to pull the motor unless its block related.

 

you never did pull the dist and spin it did you?


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#30 banzai510(hainz)

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Posted 28 August 2015 - 05:06 AM

pull front cover if anything


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#31 Draker

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Posted 28 August 2015 - 08:09 AM

I didnt, just ran out of time.

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#32 KoHeartsGPA

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Posted 28 August 2015 - 08:39 AM

Damnit!!!!

Post the vid and pics bud....

#33 datzenmike

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Posted 28 August 2015 - 02:03 PM

Only does it at idle? Take on a trip and just limit your idling


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#34 KoHeartsGPA

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Posted 28 August 2015 - 09:37 PM

I just thought of something remembering our conversation earlier today...., you mentioned that the chain made rattling noise while idling but when reved up the rattling and knocking went away....I'm thinking the timing chain tensioner spring might have broken...

#35 datzenmike

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Posted 29 August 2015 - 07:20 AM

I suppose anything is possible but installing that spring is like stuffing 5 pounds of shit into a 4 pound bag. Even broken it would be a tight fit.


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#36 KoHeartsGPA

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Posted 29 August 2015 - 07:47 AM

Ya, that fucker gave me battle when I built mine, it boggled my mind how a part so small could put up such a fight :rofl:

Dunno, just tossing that as a possible...

#37 Stoffregen Motorsports

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Posted 29 August 2015 - 07:56 AM

Doubtful that's the cause.

 

The L-Series race motors get the spring cut in half (just to make pulling the head and/or doing cam changes easier) and they never make noises down there.



#38 Stoffregen Motorsports

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Posted 29 August 2015 - 07:58 AM

Before you pull the engine, check the oil pump spindle and the distributor.



#39 KoHeartsGPA

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Posted 29 August 2015 - 10:54 AM

Makes sense...

Ya pump needs to come off for inspection, the other thing that comes to mind is a spun bearing, probably #1, pan will need to come off to inspect that, the motor I bought from Julian had a spun bearing, couldn't tell until I took apart all rods from crank, visual inspection didn't reveal the problem in this case, crank shaft was trashed and cylinders badly damaged by the metal in the oil.

This is how it looked...
IMG_20140524_165936.jpg

IMG_20140524_165751.jpg

#40 datzenmike

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Posted 29 August 2015 - 10:56 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?


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