Knocking after flywheel replacement

[Ross73]

Hey guys, i bet you have seen people asking this a million times. But i am at a complete loss, I replaced the flywheel on my 1835 with a lightened one as well as replaced the pushrod tubes due to them leaking! But i put it back in and it is knocking down my door like an angry neighbor. I shimmed the flywheel accordingly, i made sure everything was clean and tidy, i adjusted my valves and everything. Still knocking. I am wondering if its the fly wheel but before i go tearing the engine out for a 3rd time i just want some input from the community!

Thanks in advance

-Andrew
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Im 18 and own 3 VW's!

-1973 standard bug slammed Daily
-1965 Custom chopped convertible Dads Handmedown!
-1959 Standard beetle (Yard art)

[Glenn]

Should be easy to know if it's the flywheel or rockers.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

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#BlueSquare

עַם יִשְׂרָאֵל חַי

[oprn]

Grab the pulley with both hands and yank it back and forth as hard as you can. You are feeling for end play in the crankshaft/ flywheel main bearing. There should be very little to no perceivable end play. If it goes clunk... clunk... ... sorry bud!! The engine HAS to come back out...
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Our cars get old, we get old but driving an old VW never gets old!

[Ross73]

She is tight! Its a fresh engine with 500 miles. Had to take it out for the push rod tubes i didnt seal good enough and thought a lightened flywheel would be nice while i was there…… obviously not
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Im 18 and own 3 VW's!

-1973 standard bug slammed Daily
-1965 Custom chopped convertible Dads Handmedown!
-1959 Standard beetle (Yard art)

[Millionmph]

Check the pulley isnt smacking the tin behind it...

[esde]

It's possible that the dowels are slightly long, and sitting proud of the flywheel surface. Then you tighten the gland nut against the dowels, but the flywheel is loose. Ask how I know
The thickness of the flywheel where the dowel holes are drilled is not consistent, so it happens.
I know you scrutinized it when you did the endplay, but you weren't looking for this. And in my case it wasn't obvious till it was spinning at 3k. It was just barely loose, but even a little bit of wiggle makes a hell of a racket at speed
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[modok]

Knocking is a loose part slamming into another part.
So simple, yet so complex

Ideally what you should do is stop and FIX the problem just before the parts involved become unsalvageable.
Which is tricky to correctly predict, but, it is still the goal, and I still believe it is possible.

[nsracing]

When you are looking for 'fixes" to things needing nothing - is exactly why this happens.

If you did the proper shimming should be like the flywheel never left. If you forgot to torque it - could also why it is prolly chewing something.

Hopefully you did not induce a fresh rebuild w/ this flywheel swap.

[ORANGECRUSHer]

I bet you left your 10mm in there
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Brian H.

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[Ross73]

Well now that it has been almost a year later I have come to tell the reason! a piece of hard ass silicon got down the intake and was smacking between the piston and head. Learned my lesson about using silicon/RTV on a Volkswagen. Really made me smack my head against the wall.. But now its fixed and I have almost 5k miles on this build! Thanks for the responses guys.
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Im 18 and own 3 VW's!

-1973 standard bug slammed Daily
-1965 Custom chopped convertible Dads Handmedown!
-1959 Standard beetle (Yard art)

[sidemarkers]

Before you tear it apart reach behind the shroud, grab the fan and make sure it's not loose

[raygreenwood]

[liquidrush]

I know this isn't VW related but I was at a car show a couple years back and was checking out this sweet 57. When I got around to the engine there was blue silicone squishing out from every gasket on the thing. Carb base, valve covers, intake, water pump, tstat housing, fuel pump, oil pan, everywhere! It was absolutely horrible to look at and I can't believe someone thought that was good. I mean rtv has its used but man, that was the worst I've ever seen.

[modok]

Yeah, it does not look Profesional at all imo, I hate that.
For me the stigma is the orange silly cone.
But it is a very useful sealant.

If orange silicone in a bergman oring groove does turn out to be the best way to seal the case, nobody will ever try it anyway, due to what it reminds us of.

[Dusty1]

Blue silicone should be absolutely nowhere on a VW engine. Red silicone only and only at the cylinder bases.

That blue shit is the signature of a hack. Blue silicone "worms" have an uncanny knack of finding their way into the worst possible places such as oil galleries.


Finding a blob yo- yo'ing around inside a cylinder is a happy ending. Better I say than an 8mm nut bouncing around in there or the same silicon super ball clogging an oil passage.

.
.

[raygreenwood]

[Dusty1]

[raygreenwood]

[modok]

Well Ray.....i think you forgot more about sealant than most ever know.
Why would you use ultra grey on a thin gasket anyway? There might be a reason the gasket is "thin", eh?

Remember the ultra grey has solid particles in it which space the joint apart, this prevents squeezing out all the sealant, which is good, but changes the fit of parts, which is sometimes not desirable.
It's not good or bad, just how it is and both have their place, but your method of getting a THIN film by rolling which you have preached about many years for the case, will not really work correctly with the grey silicone since it has solid particles in it.

https://www.thesamba.com/vw/forum/viewtopic.php?t=...;start=140

[oprn]

The worst case of silicone abuse in my experience was my cousin's Rabbit. The PO had hit a rock with the oil pan, took it off and beat it back out, the siliconed the living be Jesus out of it and put the car up for sale. After a year of driving it my cousin brought it to me because it just was not running right.

On disassembly there were rivers of silicone running down the inside and across the bottom of the oil pan. The oil pickup screen was full of it and cast aluminum oil pump pick up was cracked at the top from the rock impact. I don't know how that engine got any oil at all! Maybe just the splash? For a whole year!

The valve train was a total write off, the cylinders scored badly as were the bearings. The only thing salvageable was the bare engine block.
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Our cars get old, we get old but driving an old VW never gets old!