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#1
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One noisy lifter on startup and sometimes restart........
Hi All:
Have any of you guys experienced 1 noisy lifter on startup? I have about 1000 miles on a fresh build. If it matters, the cam is a mild Lunati and the lifters were supplied in their kit. The engine is basically a stock Pontiac 400 in my '78 TA. Sometimes in the morning when I first start it up - one lifter ticks for some time - sometimes it's 10 seconds - yesterday it was for about the first 2 minutes of driving the car. This also happens sometimes when I run errands and leave the car sitting in the parking lot for 10 or 15 minutes. On restart I sometimes get a tick for 3-5 seconds. I'm running Shell Rotella T4 15W-40 and I get 20 lbs. of oil pressure per 1000 RPM when the engine is warm until I hit the pump relief at about 58 lbs. On cold start oil pressure is an immediate 50 lbs. The ticking always goes away - but it's a bit annoying. Is this just "the way it is"? Thanks, Chris |
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#2
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Just a thought. Are you sure the tick is coming from a lifter? Could it be an exhaust manifold gasket leaking which can have a tick type sound that lasts only a few seconds?
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#3
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I hadn't really considered that but it's certainly easy enough to see if the bolts are tight.
I would think that would only apply when the engine is cold - but I get this "tick" even on hot restart after the car sits for 15-20 minutes - so I assumed it was a lifter leaking down. Thanks, Chris |
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#4
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Does the motor have its stock Exh Manifolds?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#5
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New Ram Air Restorations manifolds.......
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#6
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Ok, so no possibility of a leaky heat riser then.
Pull the oil filler cap off and the tube to the air filter from the valve covers , then get a lenght of 3/4" heater hose and listen into each valve cover while someone else restarts the motor and you will for sure hear if it's coming internally from a rocker, or a Exh leak.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#7
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Try a 5 w-40 oil and see how the lifters react.The 5w oil will flow the best when cold and if it’s a hydraulic lifter leak down issue it should stop ticking almost instantly.If it works move up to a 10 w-40 if you feel more comfortable with that weight of oil.
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#8
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Quote:
Rotella T no longer has enough zinc in it so you have to put an additive like Lucas Engine Break-in additive always. If your running without additive now your doing damage. I have encountered the same as well and some can be quieted down with a lash adjustment and some noise can be attributed to the brand or type rocker arms being used. As long as they pump up and noise goes away after some operation I would not chase it too far. Jeff
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
#9
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oil viscosity
I had the some lifter noise at startup with heavier oils in the colder months. Since switching to VR1 10W30 noise has stopped! Viscosity at startup is a player. Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, DUI HEI and Ram Air pans and RARE Long Branch Manifolds |
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