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Author Topic: noisy vavletrain on passenger side  (Read 471 times)

Offline chargerdon

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noisy vavletrain on passenger side
« on: April 03, 2017 - 03:43:22 PM »
I have a 360 LA engine that was rebuilt by a professional engine builder.   It has in it a Mopar Performance Purple 508 hydraulic camshaft.

 I have just now started to drive the car and it has less than 300 miles since its rebuild.   I have noticed that the passenger side has a noisy valve train, sounds like from the 2 cylinders closest to the firewall.   Not exactly a ticking valve but..kinda like it but..simply noisy. 

So, I took off the valve cover to inspect, and found nothing.   None of the valve rockers  seem to have any up/down clearance but they will slide a little left to right.   I did notice some casting numbers on each rocker, and do not know what they mean.   They are:

          8                                6                                       4                                2
left          right                  left       Right                     left         right             left      rght
712  T     712  T              712  T    712  T                  712LT     7r  T             H1LT     H1RT

Note:  the no 4 Left that reads 712LT   The L is lower that the other three numbers  and the no 2 right H1RT the R is lower than the other numbers.  I.e like subscript.

Also, while im listed them as 712 Im not real sure that it is actually 712 and not 7]2   


Anyone know if these mean anything and why differences in them???   






Offline burdar

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Re: noisy vavletrain on passenger side
« Reply #1 on: April 03, 2017 - 03:57:36 PM »
Has it always made noise or did this just start recently?  There are "left" offset and "right" offset rocker arms.  The engine uses a combination of both.  Make sure they were put back on in the correct order.  The rocker should be centered on the valve tip. 

I hope you don't have a cam lobe going way.  You could try removing the lifters from that cylinder and see what they look like on the bottom.  You can get a cheap lifter removal tool from your local parts store.

Offline chargerdon

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Re: noisy vavletrain on passenger side
« Reply #2 on: April 03, 2017 - 05:01:05 PM »
Yeah, I'm worried about a cam lobe...or a lifter going bad.   Its a very loud engine (Flowmaster 40's) and i didnt notice the lifter noise at first...   but then i was always listening to the exhaust noise.   I would say it has gotten louder within a few hundred miles.   

You have to remove the intake manifold to pull out a lifter to look at it and the cam lobes??  Right?? 


Offline 734406pk

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Re: noisy vavletrain on passenger side
« Reply #3 on: April 03, 2017 - 07:47:16 PM »
Check for an exhaust leak, it can sound just like a valve tick sometimes. Retorque all of the header/exhaust manifold bolts.
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Offline cudabob496

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Re: noisy vavletrain on passenger side
« Reply #4 on: April 03, 2017 - 10:59:56 PM »
is valve train hitting valve cover. look for shiny spot.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

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Re: noisy vavletrain on passenger side
« Reply #5 on: April 04, 2017 - 01:42:04 AM »
can always run with valve cover off to see problem easier.
just start it cold, with towels all around
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline burdar

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Re: noisy vavletrain on passenger side
« Reply #6 on: April 04, 2017 - 09:59:58 AM »
If you buy the lifter removal tool, you don't have to pull the intake.  You can lift them right out.  There is a possibility that the heads have some extra casting flash on them which may prevent the lifter from passing through the opening though.  You should still be able to lift it out of the block and see the cam lobe.

Checking for an exhaust leak is a good idea.  I think they sell stethoscopes at Harbor Freight.  Those work great at finding exhaust leaks. 

Offline cudabob496

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Re: noisy vavletrain on passenger side
« Reply #7 on: April 04, 2017 - 02:38:18 PM »
ticking noise can also happen when pushrod hits against head. Had that.
Pushrod can be bent if over rev engine.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline chargerdon

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Re: noisy vavletrain on passenger side
« Reply #8 on: April 04, 2017 - 03:51:07 PM »
will check for exhaust leaks.. 

Nobody knows what the markings on each rocker mean ?

Offline burdar

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Re: noisy vavletrain on passenger side
« Reply #9 on: April 04, 2017 - 04:28:27 PM »
They could be part #s.(you might have a mixed and matched set) They could also be manufacture #'s...date codes exc...  Some of them have an L in the # and others have an R in the #.  That's probably left and right.  Make sure they are offset correctly.

If you think they are suspect, Summit Racing has brand new stock style rockers for a very reasonable price.

Offline Chryco Psycho

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Re: noisy vavletrain on passenger side
« Reply #10 on: April 08, 2017 - 07:56:30 PM »
are you getting lots of oil , the cam brg could be out of position & starving the rocker on one side .
with a good extendable magnet you can pull all of the lifters 1 by 1 & check them

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Offline chargerdon

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Re: noisy vavletrain on passenger side
« Reply #11 on: April 14, 2017 - 10:35:33 AM »
Regarding oil, the engine has excellent oil pressure...   80 PSI on cold startup, 50-60 going down the road and 25 at 800 rpm idle after fully warmed up.   When i took the valve cover off, there was oil laying in the valleys of each of the rockers.   So, oiling looks good to me.  Because of good pressure, i am very hesitant to run the engine with covers off to try and detect which lefter(s) are creating the problem.

Cold, i could not detect any clearance in any of the valves when closed.

Last issue is that they do get Noisier when fully warmed up than they are cold.   Does this point to a lifter itself??   

Offline mopar jack

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Re: noisy vavletrain on passenger side
« Reply #12 on: April 14, 2017 - 11:36:39 AM »
When there is a clicking sound and nothing obvious is found I always recommend checking the torque converter bolts. If they back out a small amount they will hit the block or if you have the dust cover they will hit that and give a metal click type sound. Very easy to check, just lift and support the car and crawl under and listen. If your manifolds are leaking at the head pipe you'll be able to reach around and feel for a leak.

Offline xtopfuel

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Re: noisy vavletrain on passenger side
« Reply #13 on: April 14, 2017 - 11:37:46 AM »
just out of curiosity have you dumped the initial oil from the rebuild? I don't suggest running the engine with rocker covers off, I do suggest removing the rockers and closely inspecting the tips for abnormal wear can also check for a collapsed lifter by pushing the rocker downward into the lifter, you should not have the strength to compress

Offline 1 Wild R/T

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Re: noisy vavletrain on passenger side
« Reply #14 on: April 14, 2017 - 11:39:02 AM »
Take a photo showing all the rockers on that side & post it....
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