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post #1 of (permalink) Old 11-07-2002, 11:12 AM Thread Starter
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Strange knocking in 1st gear

Good afternoon, all. Recently, I've noticed a knocking or tapping sound in my 81 CJ7 (304, T-176). It sounds sorta like spark knock or a valve tap, but heavier, if that makes sense. Also, the sound seems to come from lower in the engine & ONLY when starting off in 1st gear. I have bad 1st/2nd synchros in the tranny .. could this noise be related (or something else tranny related)? Thanks in advance for your thoughts.
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post #2 of (permalink) Old 11-07-2002, 05:57 PM
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Re: Strange knocking in 1st gear

My brother bought an old Chevelle a few years ago that had a knock so he got it cheap.. He took it to his shop, put it on the lift and tightened the bell housing bolts (tranny slapping the block) and traded the Chevelle for a sweet Cuda. [img]images/graemlins/grin.gif[/img]
My Jeep has a knock when I take off but I found it today and didn't have time to mess with it but it's the exhaust hitting the skid plate. [img]images/graemlins/crazy.gif[/img]
You might have to enlist the help of a friend or relative to help you track it down, but hopefully it's something simple. [img]images/graemlins/smile.gif[/img]
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post #3 of (permalink) Old 11-07-2002, 06:35 PM
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Re: Strange knocking in 1st gear

might also check the engine mounts, a loose rubber coupler could allow it lift under load then drop, makeing a tap down low on engine.

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post #4 of (permalink) Old 11-08-2002, 12:03 AM
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Re: Strange knocking in 1st gear

....or you could open it up like I did a few nights back and find bearing scraps in the oil pickup!!!! [img]images/graemlins/frown.gif[/img]

I had a tapping, but it was at the top end since my oil pressure was less than the atmosperic pressure!

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