Technical Question and Answer - On topic to 71-74 Plymouth B-bodies only.
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billzilla
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by billzilla » Fri Jun 06, 2008 3:10 pm
I have a pretty obnoxious tap in the low end (it sounds like)... It seems to come and go, so I'm guessing it's just a sticking lifter. Is that red bottle Marvel stuff the best, or what?
That is, other than a rebuild... (cough)

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71Runner
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by 71Runner » Wed Jun 11, 2008 8:05 pm
I've had luck in the past by dumping a quart of tranny fluid in the crank case and running it a while.
ETA, guys I wasn't recommending using the tranny fluid to mask it, rather free it up if it's stuck. It worked for me in a 400 Pontiac mill I had in an old T/A.
Last edited by
71Runner on Fri Jun 13, 2008 7:12 pm, edited 1 time in total.
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moparmodeler
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by moparmodeler » Fri Jun 13, 2008 9:39 am
I am against using anything to mask a noise, It does not really solve your problem.
You should check your timing. If your timing chain is worn and stretched it will make a ticking sound from the lower end.
If your timing fluctuates a lot when checking RPM range, I would definitely look into replacing the timing chain and timing gears.
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Smellslike1974
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by Smellslike1974 » Fri Jun 13, 2008 10:49 am
moparmodeler wrote:I am against using anything to mask a noise, It does not really solve your problem.
You should check your timing. If your timing chain is worn and stretched it will make a ticking sound from the lower end.
If your timing fluctuates a lot when checking RPM range, I would definitely look into replacing the timing chain and timing gears.
I totally agree,theres noise for a reason.
But then again,i was once told to just turn my radio up when knocking occured.
but i wouldnt recommend that.
"Sunny D"-1974 Plymouth Satellite Sebring With Sundance Packaging
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billzilla
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by billzilla » Sat Jun 14, 2008 1:09 am
I dumped in some of the Marvel lube and noticed that if I drive it hard on the freeway for at least 10-ish miles the ticking dies down almost to nothing. That seems to have the opposite effect at other times, though - sometimes I get where I'm going and the ticking is louder than when I left.
Sometimes, it's audible at idle, revving, etc. - but most of the time it's only really noticeable when you rev and the idle drops down.
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moparmodeler
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by moparmodeler » Sat Jun 14, 2008 7:00 am
I would definitely say timing chain!
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billzilla
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by billzilla » Tue Jun 17, 2008 12:47 pm
Has anyone here done their own timing chain?
It's in keeping with that theory, then, for the ticking to come and go?
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dragman440
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by dragman440 » Wed Jun 18, 2008 4:50 pm
Been there done that. Thermal expantion will cause the noise to come and go. Mopars have week timing chains and sometimes plastic like cam gears. If I remember right. I would recomend a good double roller timing set of any brand. BE SURE you line up the timing marks on the gears. Some chains are fancy and let you advance or retard the cam timing. Just install it at "0". Mopar Performance sells an oil slinger for a few bucks that installs on the end of the crank after the crank gear and before the timing cover. they will keep the oil on your new chain an keep excessive oil off the front crank seal.
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mopar71
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by mopar71 » Wed Jun 18, 2008 9:10 pm
When I had my first roadrunner I had a nylon timing gear, I think the reasoning was for the noise dampening, I installed a double roller as a replacement, it will make a little more noise.

MOPAR (Move Over Plymouth Approching Rapidly)