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Knocking noise?
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kyleshepherd622
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PostPosted: Mon Sep 29, 2014 7:03 am    Post subject: Knocking noise? Reply with quote

Hi
My motor is making a very strange knocking noise. It's a 1600 dual port with dual carbouretors. It sounds like a click, or tap, in unison with the exhaust putting. Obviously internal. And only from the left side of the motor, as in driver side if it's installed. The engine was gone through by myself a few months ago, valves adjusted, new rings, polished cylinders. I removed the cylinder heads and they looked fine so I put them back on. No real problems. Now we've been putting 30+ miles on it every day and this noise has come up. What do you think it is? Valve tapping? Rod knock? Worse??

I'll post a video of the noise after it finishes uploading to YouTube.
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kyleshepherd622
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PostPosted: Mon Sep 29, 2014 7:08 am    Post subject: Reply with quote

Oh, and the reason I'm not just immediately dropping the engine is this is still my daily driver and I don't want to be screwing around without a car if it's nothing. Wink
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shortride
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PostPosted: Mon Sep 29, 2014 7:12 am    Post subject: Reply with quote

It's difficult to diagnose and engine here. It could be a number of things. Could be a rod or main bearing making the noise or even an exhaust leak making the noise. Generally when you only partially rebuild an engine and don't know the history or complete condition of the engine it's will pay off in the long run to go all of the way and rebuild the engine. That way there aren't any surprises later as you have experienced. Daily driver or not you may have to have it rebuilt.
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Last edited by shortride on Mon Sep 29, 2014 8:17 am; edited 2 times in total
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kyleshepherd622
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PostPosted: Mon Sep 29, 2014 7:16 am    Post subject: Reply with quote

How deep are the main bearings? Do I have to split the case?
Thanks

Oh, and here's the noise: http://youtu.be/qdSVcxZACqA
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shortride
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PostPosted: Mon Sep 29, 2014 7:22 am    Post subject: Reply with quote

kyleshepherd622 wrote:
How deep are the main bearings? Do I have to split the case?
Thanks


You will need to split the case. Basically a complete rebuild if you have to do that. If the engine has a lot of miles on it, the crank would need to be inspected and machined which would require all new bearings.
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kyleshepherd622
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PostPosted: Mon Sep 29, 2014 7:27 am    Post subject: Reply with quote

Okay, thanks for your help.
I'll check it out and see what I can do about a rebuild.

How long would a rebuild last? Would that be a permanent fix? Or would this knocking come back in a year?
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shortride
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PostPosted: Mon Sep 29, 2014 7:34 am    Post subject: Reply with quote

kyleshepherd622 wrote:
Okay, thanks for your help.
I'll check it out and see what I can do about a rebuild.

How long would a rebuild last? Would that be a permanent fix? Or would this knocking come back in a year?


How long it take to rebuild would depend on how experienced the rebuilder is and the availability of parts. A professionally rebuilt engine will last a long time and many miles if done correctly and serviced as it should be. It's only a matter of having the money and resources to have a well built and dependable engine. It would pay to have someone that has experience building a VW engine.

Some of the VW engine building guys here may contribute to this thread.
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Last edited by shortride on Mon Sep 29, 2014 8:05 am; edited 1 time in total
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candyman
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PostPosted: Mon Sep 29, 2014 8:02 am    Post subject: Reply with quote

Have you checked for an exhaust leak? They are pretty easy to find and can give tapping knocking popping like sounds, depending on how bad it is. I recently had a leak on one of my riser tubes, sounded just like loose valves. It surfaced about 30 miles after recent overhaul and install
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grandpa pete
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PostPosted: Mon Sep 29, 2014 8:06 am    Post subject: Reply with quote

Stop driving the car.....take the valve covers off and make shure your knock isn't a dropped valve BEFORE it knocks a hole in the piston....I had a little knock that I listened to..... until the piston blew out

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iowegian Premium Member
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PostPosted: Mon Sep 29, 2014 8:11 am    Post subject: Reply with quote

candyman wrote:
Have you checked for an exhaust leak? They are pretty easy to find and can give tapping knocking popping like sounds, depending on how bad it is. I recently had a leak on one of my riser tubes, sounded just like loose valves. It surfaced about 30 miles after recent overhaul and install

I'm hearing an exhaust leak. Confused
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johnnypan
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PostPosted: Mon Sep 29, 2014 8:24 am    Post subject: Reply with quote

Main bearings don't tap or knock, rod bearings and wristpins do..so does your valve train..or as Iowegian says he hears an exhaust leak..I hear a crock of shit,but he hears an exhaust leak..
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kyleshepherd622
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PostPosted: Mon Sep 29, 2014 8:33 am    Post subject: Reply with quote

It had an exhaust leak, and I bought new seal clamp pieces and it stopped. I'm about halfway sure it isn't exhaust leak.
So it wouldn't be bearings is what I'm hearing?
I'll check it out when I get home.
Pull the heads and cylinders and check the piston rods, and check the valves. If they're fine, I'll take it to a professional. If they're busted I'll fix em!
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iowegian Premium Member
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PostPosted: Mon Sep 29, 2014 8:34 am    Post subject: Reply with quote

johnnypan wrote:
Main bearings don't tap or knock, rod bearings and wristpins do..so does your valve train..or as Iowegian says he hears an exhaust leak..I hear a crock of shit,but he hears an exhaust leak..

I bow to JohnnyPan's superior intellect. Embarassed
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60ragtop
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PostPosted: Mon Sep 29, 2014 8:35 am    Post subject: Reply with quote

you sure it's not the dog's tail beating on something Wink
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johnnypan
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PostPosted: Mon Sep 29, 2014 9:00 am    Post subject: Reply with quote

iowegian wrote:
johnnypan wrote:
Main bearings don't tap or knock, rod bearings and wristpins do..so does your valve train..or as Iowegian says he hears an exhaust leak..I hear a crock of shit,but he hears an exhaust leak..

I bow to JohnnyPan's superior intellect. Embarassed


didn't think you could fold something that short in half..
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mukluk
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PostPosted: Mon Sep 29, 2014 6:50 pm    Post subject: Reply with quote

Sounds like noisy valves and a bit of an exhaust leak from what I can hear in the video.
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drscope
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PostPosted: Tue Sep 30, 2014 9:24 am    Post subject: Reply with quote

I didn't listen to your video, but I suggest you start with the simple stuff. When the engine is COLD, pop the valve covers off and check your valve adjustment.

It's pretty easy for that stuff to get loose since it's entire life is just hammering. It may something as simple as one loose valve.

While you're in there check to make sure the nuts holding the rocker assembly are tight.

Since you just went through things I would suspect something came loose.

Start there. Then if that isn't the problem, look a little deeper.
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kyleshepherd622
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PostPosted: Tue Sep 30, 2014 9:27 am    Post subject: Reply with quote

Alright, thanks guys. Your input is appreciated
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Spezialist
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PostPosted: Tue Sep 30, 2014 5:06 pm    Post subject: Reply with quote

I listened to your bug and it sounds pretty deep for a valve tappet, but regular like the cam gear loose.
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Brian Anthony
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PostPosted: Tue Sep 30, 2014 5:37 pm    Post subject: Reply with quote

Sounds like an exhaust leak to me.
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