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General Information => General => Topic started by: srgtlord on November 28, 2012, 12:21:36 pm

Title: The occasional bottom end hollow clunk.
Post by: srgtlord on November 28, 2012, 12:21:36 pm: So I never really thought about this until now but, just figured it was just one of those vw noises , but what would cause an occasional bottom end knock on a NA 1.6 that would last anywhere from 15 seconds to 1 minute? Just wondering if there is something else I should look at with the engine out.
Title: Re: The occasional bottom end hollow clunk.
Post by: ORCoaster on November 28, 2012, 12:52:33 pm: OIL Pump?
Title: Re: The occasional bottom end hollow clunk.
Post by: RabbitJockey on November 28, 2012, 12:56:03 pm: When do u hear it? And what makes u think its bottom end? Is it just after a cold start?
Title: Re: The occasional bottom end hollow clunk.
Post by: srgtlord on November 28, 2012, 06:32:35 pm: It used to be only after a cold start . It sounded like someone was hitting the oil pan with a hammer.
Title: Re: The occasional bottom end hollow clunk.
Post by: theman53 on November 28, 2012, 06:44:36 pm: Tell that someone to knock it off...Or take the hammer away.
Title: Re: The occasional bottom end hollow clunk.
Post by: ORCoaster on November 28, 2012, 07:46:39 pm: Make me chuckle,.. Something then, he meant something not someone. Or is it the comparative method of association in which he speaks.

Trolls perhaps? Don't they live under things?
Title: Re: The occasional bottom end hollow clunk.
Post by: RabbitJockey on November 28, 2012, 08:10:07 pm: It's probably just normal diesel clatter or ur timing is too advanced when a friend of mine first got his diesel rabbit together he thought the pistons were slamming into the head or something, this was in the summer, I told him loosen the pump and rotate it away from head a bit and all was well
Title: Re: The occasional bottom end hollow clunk.
Post by: srgtlord on November 29, 2012, 04:23:53 am: Damn gremlins
Title: Re: The occasional bottom end hollow clunk.
Post by: RabbitJockey on November 29, 2012, 04:28:05 am: Quote from: srgtlord on November 29, 2012, 04:23:53 am
Damn gremlins

I named all mine Ronnie, Bobby, Ricky, and Mike.
Title: Re: The occasional bottom end hollow clunk.
Post by: theman53 on November 29, 2012, 04:37:40 am: I would think it would be fuel related. Maybe injector related. Even my TDI will make some bad noise whenever it is cold and cold starting. I think what trev said is accurate as well.

If there is a hammer down there you should take it away, the pans dent eventually.
Title: Re: The occasional bottom end hollow clunk.
Post by: srgtlord on November 29, 2012, 05:11:21 am: But the strange thing is the issue would come back after fully warmed up at idle after it reached operating temps.
Title: Re: The occasional bottom end hollow clunk.
Post by: TylerDurden on November 29, 2012, 05:52:06 am: How old are the IM shaft bearings?
Title: Re: The occasional bottom end hollow clunk.
Post by: srgtlord on November 29, 2012, 06:06:56 am: Lets put it this way, I plan on replacing them. Im just not sure if this will solve this odd issue.
Title: Re: The occasional bottom end hollow clunk.
Post by: ORCoaster on November 29, 2012, 11:18:52 am: Quote from: srgtlord on November 29, 2012, 04:23:53 am
Damn gremlins

???? Isn't this the season to be hanging and ringing bells????

Put a bell on it. Then you won't hear the hammer like noise
Title: Re: The occasional bottom end hollow clunk.
Post by: pointynoggin on November 29, 2012, 08:03:54 pm: I got a cherokee that did something like that, 5sec of hammering on start up. Turned out to be the harmonic balancer.