ClassicCar

harry54

I'm having trouble with my 54 hornet 308. The engine has developed a tapping and mis . It sounds like a lifter . Any ideas as to how to address this ?

nhp1127

Harry,

It may turn out to be a bad valve? Niels

DaveFury

Harry,

It could be a loose valve guide allowing a valve to rock or a piece of carbon holding a valve open and not allowing it to seal against the valve seat in the block. Perhaps do a compression check and if you find one low, pull the head to inspect.

harry54

I don't think it's carbon.... Makes to much noise..... get's worse as the engine warms up.....

Fred C

Harry

If the vehicle has been sitting for a while it could be a stuck valve, which will give you a mis and tapping. Try an engine top oil down the carb(s) with the engine at operation tempature and at a high idle speed - you will make a lot of smoke but it should un-stick the valve.

Fred

harry54

This is my driver... it's had alot of use over the last few years.... Would a stuck valve make a big tapping noise ? It's deffeinitly valve related though....

esfoder

Always start with the easiest thing first. I would check the compression then go from there? At least it might tell you where your problem is?

Good luck

Maybe try unplunning your spark plug wires one at a time? See if it quits or at least changes

harry54

I tried disconnecting wires ....makes no difference ...same noise.....

bull islander

If you think it's a stuck valve, find some of this stuff and spray it into the spark plug holes. www.kanolabs.com Kroil

'47HUD

Had this happen myself on my '54 Hornet coupe, had the best results running engine until completely warm, removed both air cleaner's from carb's, then poured Marvel Mystery oil down both carb's with engine running just above idle speed. Pour it into carb's a couple ounce's at a time, then release the throttle and let the engine stall. Turn off ignition and walk away from it for a few days, the Marvel oil will do the rest of the job ! !

good-luck

'47HUD

Geoff C., N.Z.

Do a compression test to find which cylinder it is. It could be broken piston ring, or a stuck valve. If it's a stuck valve, it is usually the exhaust valve, and you should be able to knock it down through the plug hole.

Geoff.

Hudsonrules

:DI have had a similar problem years ago on my '49 Commodore, that Marvel Mystery oil helped to solve the noise and miss that went with it. Good Luck. Arnie

Hudson308

If the Marvel Mystery Oil trick doesn't work, do a comression check to find out which cylinder is giving the trouble. If the exhaust valve seems to be moving okay as viewed down the plug hole, pull the tappet cover off and check the tappet clearance.

harry54

thanks I'll try the marvel mystery oil ... I'll get back to you'all thx....

harry54

I'd like to say thanks for all the help. I tried the Marvel in the Carb and kroil. I directly sprayed the kroil into the bad cylnder. It worked.... That stuff is golden... Engine running much better... As good as before.. I guess it must have been a stuck exhaust valve... Thanks again to all ....

ClassicCar

Howdy, Stranger!

Categories

In this Discussion

We'd love to hear from you! info@classiccar.com