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Username Post: 67 Impala valve ticking        (Topic#350792)
muncher 
Poster
Posts: 34

Loc: New Zealand
Reg: 02-18-17
04-25-18 02:07 AM - Post#2732114    

Hi There. Occasionally I get a ticking sound from the lifters. It happens once the engine has warmed up. I have adjusted the valve lash and used an additive to free lifters. Hasn't really helped. Can't work out why it doesn't do it all the time and why only when warm. Does anyone have any ideas. Cheers.



 
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jktucker92 
Silver Supporting Member
Posts: 204
jktucker92
Reg: 02-05-17
04-25-18 08:58 AM - Post#2732153    
    In response to muncher

Need more information. What engine? Hydraulic or Solid lifters? Is it the same valve you re-adjust every time?
Assuming it's a hydraulic lifter in a small block chevy:
The fact that it happens only when warm makes it sound like the lifter isn't adjusted properly. When you've re-adjusted it have you tightened it each time? If so, it's possible the cam lobe has failed and is wearing down. Hence, when the clicking re-appears you tighten it down and it's fine until the cam lobe is ground down some more. If you have access to a dial indicator, you can check the lift on each lobe of the cam and make sure all the valves have roughly the same lift.
The SBC has few weaknesses, but the one that is talked about is that the oil passages to the cam are the first that get plugged and it's common to find a bad cam in a SBC.
It's also possible that just the lifter is bad. If the hydraulic lifter is not pumping up and maintaining position, it could also cause a lifter tick. Since oil is thinner when hot, it will leave the lifter faster when warm, hence the problem is only present when the engine is hot.



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2151
aghaga
Age: 63
Loc: Altavista, Va.
Reg: 07-05-08
04-25-18 10:00 AM - Post#2732157    
    In response to jktucker92

A defected fuel pump will make a very similar noise.



 
astrojet427 
Member
Posts: 141
astrojet427
Loc: Vancouver, B.C.
Reg: 11-22-05
04-25-18 09:54 PM - Post#2732223    
    In response to aghaga

How is your oil pressure at idle when hot? If on the low side, you may get ticking. Try 15W or 20W oil to raise pressure. May help if this is the case.

1967 Impala SS. 327-Turbo 400; 12 bolt-3.55 gears. A few photos of my '67.

1972 Corvette Convertible Mille Miglia Red 4 speed.

1963 Cadillac Eldo-Triple Black.


 
muncher 
Poster
Posts: 34

Loc: New Zealand
Reg: 02-18-17
04-26-18 03:59 AM - Post#2732229    
    In response to astrojet427

It has hydraulic lifters. Seems to be coming from the 5 and 7 cylinder area. Going to take cover of to check again. My oil pressure when warm is just under 40 driving
and 15 to 20 when idling.



 
astrojet427 
Member
Posts: 141
astrojet427
Loc: Vancouver, B.C.
Reg: 11-22-05
04-26-18 11:27 AM - Post#2732268    
    In response to muncher

With those numbers. Oil pressure should not be your problem.

1967 Impala SS. 327-Turbo 400; 12 bolt-3.55 gears. A few photos of my '67.

1972 Corvette Convertible Mille Miglia Red 4 speed.

1963 Cadillac Eldo-Triple Black.


 
muncher 
Poster
Posts: 34

Loc: New Zealand
Reg: 02-18-17
04-27-18 08:34 PM - Post#2732434    
    In response to astrojet427

Yes I thought the oil pressure was good. Was wondering if I have a dodgy lifter. When I can I'm going to set the valve lash again.



 
muncher 
Poster
Posts: 34

Loc: New Zealand
Reg: 02-18-17
05-08-18 05:39 PM - Post#2733441    
    In response to muncher

Ok, I did further investigation. I have a crack in the bell housing. Also the flexiplate was cracked. I think the main cause was an out of balance drive shaft. Also I think the bushing where the drive shaft goes into trans was faulty. It was difficult getting driveshaft off. Getting the bell housing welded, new flexiplate and sort drive shaft. Should be all good after that.



 
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