Type 4 Rod Bushing Clearance..?

[DubKru]

What is the rod clearance in the wrist pin bushing? I got my rods back and they seem to have a little wiggle. How should it feel?

Robbie
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2L, Raby cam, HAM Heads, Mallory, Dual Dell 40's, Porsche discs, Fuchs (Colored matched not to my bus),tunin' the crap out of it, slammed on Wagenswest suspension.

[raygreenwood]

At room temp of about 72-75F....it should be a smooth push fit. Holding the rod in both hands....and using both thumbs...moderate pressure. No wiggle whatsoever. Without straining it should take a couple seconds to push the pin in. Ray

[germansupplyscott]

[DubKru]

New pin. I figured it shouldn't have that much slack...
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2L, Raby cam, HAM Heads, Mallory, Dual Dell 40's, Porsche discs, Fuchs (Colored matched not to my bus),tunin' the crap out of it, slammed on Wagenswest suspension.

[keifernet]

[Bleyseng]

[quote="DubKru"]What is the rod clearance in the wrist pin bushing? I got my rods back and they seem to have a little wiggle. How should it feel?

Robbie[/quote.
they shouldn't have any "wiggle" as they should smoothly push in without much effort.

take em back! and have a new pin with you.
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70 Ghia Black convert-9/69 build date-stock w/133k 1600 SP-barn find now with a rebuilt tranny and engine
77 Westy 2.0L w/Ljet, Camper Special engine-95hp and with LSD!(sold)
76 Porsche 914 2.1L L20c, 120hp Djet (sold)
87 Syncro Westy Titan Red 2.1L 2 knob 100k miles

[DubKru]

The new pin is at the machinist with the rods.

Is "friction fit" the proper terms I need to be using or are there any numbers to tell him?
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2L, Raby cam, HAM Heads, Mallory, Dual Dell 40's, Porsche discs, Fuchs (Colored matched not to my bus),tunin' the crap out of it, slammed on Wagenswest suspension.

[germansupplyscott]

the VW engine manual says, to quote directly

[DubKru]

THANKS!

I got the shop to go back and refit new bushes. The fit just didn't seem right and I wanted to make sure it wasn't just me.
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2L, Raby cam, HAM Heads, Mallory, Dual Dell 40's, Porsche discs, Fuchs (Colored matched not to my bus),tunin' the crap out of it, slammed on Wagenswest suspension.

[SGKent]

DubKru - that was a wise decision. The description Scott and Ray gave were accurate. Lightly oiled, at room temp there should be a little drag as one is pushed through but neither play nor binding. The rod should also be checked for straightness at the same time. In an ideal situation you want to do the following while your rods are out.

*check for straightness
*clean them (glass bead or shotpeen)
*verify the thrust surfaces are within tolerance (big end width)
*resize the big end, making sure the measuring after resizing goes all the way around and doesn't pinch across the cap.
*lightly clean up the thrust surfaces
*resize the small end (wrist pin end) requires new bushings usually
*verify still straight
*check the weight of the rods and pins to balance them
*check the piston weight to balance them
*test the bearing fit with plastigauge before final assembly. use the old nuts for this then use new nuts on the final assembly. Verify the thrust clearances are correct on the crank.
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"Most people don't know what they're doing, and a lot of them are really good at it." - George Carlin

[Joey]

So, without oil, should the pin drop right through the bushing or should there be resistance?
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Joey

‘60 Kombi - '74 Bus - '79 Panel - '65 Beetle

[germansupplyscott]

[Desertbusman]

[Joey]

[germansupplyscott]

i think the bushes need to be replaced if the pin will slide through under any circumstances.
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SL

[Joey]

I agree. I just have to convince the machine shop that just did them that they are wrong.
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Joey

‘60 Kombi - '74 Bus - '79 Panel - '65 Beetle

[germansupplyscott]

[Desertbusman]

The other option is only let a recognized experienced top notch VW engine builder and shop to touch the parts. Additionally, VW has published all the pertenant specs. They are there for a purpose. If you arn't following the good published info it's best not to touch the engine.
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71 Superbug
71 Westy

[Joey]

[germansupplyscott]