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BB 366 - rockers clatter; oil pressure but no oil at rockers



 
 
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  #1  
Old October 17th 05, 09:19 PM
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

Hi - I'm working on my farm's chevy 87 c-70 w/ 366 v8 (which came out
of an early 1970's era truck). The motor runs and has good oil
pressure (according to the gauge) but there is no oil coming out of the
pushrod tubes and the valves are very noisy as a result.

What would cause this to be? There is only a little trickle of oil
coming out the pushrods for the number 1 piston (the front one on the
drivers side), none at the rest. I'm noticing it now because I just
had the head off the drivers side to fix a broken exhaust valve and
once it was all put back together the noise was terrible; before taking
the head off there was no noise but still hardly any oil coming out the
tubes.

I pulled the oil pan off and the pump looks fine - no plugged screen or
damage. I also pulled off the bearing cap on a couple of the pistons
and that looked ok - no visible problem. A local motor shop told me
that if the cam or cam bearings were bad we might have oil at the back
(closest to firewall) tubes but none torwards the front. SO - I'm at a
loss.

All and any help is greatly appreciated.

Ads
  #2  
Old October 17th 05, 09:23 PM
Chas Hurst
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

Distributor 180 deg out?
" > wrote in message
oups.com...
> Hi - I'm working on my farm's chevy 87 c-70 w/ 366 v8 (which came out
> of an early 1970's era truck). The motor runs and has good oil
> pressure (according to the gauge) but there is no oil coming out of the
> pushrod tubes and the valves are very noisy as a result.
>
> What would cause this to be? There is only a little trickle of oil
> coming out the pushrods for the number 1 piston (the front one on the
> drivers side), none at the rest. I'm noticing it now because I just
> had the head off the drivers side to fix a broken exhaust valve and
> once it was all put back together the noise was terrible; before taking
> the head off there was no noise but still hardly any oil coming out the
> tubes.
>
> I pulled the oil pan off and the pump looks fine - no plugged screen or
> damage. I also pulled off the bearing cap on a couple of the pistons
> and that looked ok - no visible problem. A local motor shop told me
> that if the cam or cam bearings were bad we might have oil at the back
> (closest to firewall) tubes but none torwards the front. SO - I'm at a
> loss.
>
> All and any help is greatly appreciated.
>



  #3  
Old October 17th 05, 09:28 PM
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

I don't know - how could I tell?

  #4  
Old October 17th 05, 09:46 PM
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

Had this happen more than once .Try backing them off while it's
running one at a time and see if the oil will come through . Sometimes
they get partially collapsed and won't pump up after they've "sat" for
a bit .

  #5  
Old October 17th 05, 09:58 PM
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

Ok - I can try that. Will post back later.

  #6  
Old October 17th 05, 10:04 PM
Bruce Chang
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers


" > wrote in message
oups.com...
> Hi - I'm working on my farm's chevy 87 c-70 w/ 366 v8 (which came out
> of an early 1970's era truck). The motor runs and has good oil
> pressure (according to the gauge) but there is no oil coming out of the
> pushrod tubes and the valves are very noisy as a result.
>
> What would cause this to be? There is only a little trickle of oil
> coming out the pushrods for the number 1 piston (the front one on the
> drivers side), none at the rest. I'm noticing it now because I just
> had the head off the drivers side to fix a broken exhaust valve and
> once it was all put back together the noise was terrible; before taking
> the head off there was no noise but still hardly any oil coming out the
> tubes.
>
> I pulled the oil pan off and the pump looks fine - no plugged screen or
> damage. I also pulled off the bearing cap on a couple of the pistons
> and that looked ok - no visible problem. A local motor shop told me
> that if the cam or cam bearings were bad we might have oil at the back
> (closest to firewall) tubes but none torwards the front. SO - I'm at a
> loss.
>
> All and any help is greatly appreciated.
>


You might go to a local autozone and "loan a tool" the oil pump primer tool.
You put it in place of your distributor and use a drill to spin the oil pump
shaft to give you oil pressure without running the top of your engine
without any lubrication.

-Bruce


  #7  
Old October 17th 05, 11:04 PM
Chas Hurst
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers


" > wrote in message
oups.com...
> I don't know - how could I tell?

No oil to the lifters.


  #8  
Old October 18th 05, 01:32 AM
shiden_kai
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers

Chas Hurst wrote:

> Distributor 180 deg out?


Right.....the motor runs, but the dist may be 180 out?
Where do you guys come up with these guesses?
Even with the dist 180 out, what does that have to
do with the oil pressure?

Ian


  #9  
Old October 18th 05, 02:47 AM
Chas Hurst
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers


"shiden_kai" > wrote in message
news:[email protected]
> Chas Hurst wrote:
>
> > Distributor 180 deg out?

>
> Right.....the motor runs, but the dist may be 180 out?
> Where do you guys come up with these guesses?
> Even with the dist 180 out, what does that have to
> do with the oil pressure?
>
> Ian


It's not a guess but a foggy remembrance of some engine that has a
distributor body that impedes the flow of oil to the lifters if fitted
correctly. If fitted incorrectly it blocks the flow of oil completely.
Now do you have some advice for the OP?


  #10  
Old October 18th 05, 03:34 AM
Bob
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Default BB 366 - rockers clatter; oil pressure but no oil at rockers


"shiden_kai" > wrote in message
news:[email protected]
> Chas Hurst wrote:
>
>> Distributor 180 deg out?

>
> Right.....the motor runs, but the dist may be 180 out?
> Where do you guys come up with these guesses?
> Even with the dist 180 out, what does that have to
> do with the oil pressure?
>
> Ian


That guess is so far off it can't even be described as "wild assed"
Bob


 




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