| [ Total Views: 624 | Total Replies: 6 | Thread Id: 102728 ] |
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 Jimmy Wackburns
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| posted on July 11th, 2013 at 03:27 PM |
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Piston pin bushing.
Hi there,
I'm having difficulty honing the new piston pin bushings on standard rods. No matter how careful I am a taper develops from the centre of the small
end to the outer/thrust edges. The pins slide in with the correct amount of resistance but rock. The hone has new stones which are unmarked. Would I
be better off trying to use a reamer? I don't recall having this problem before with previous engines. Any advice would be appreciated.
Cheers Jimmy.
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vlad01
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| posted on July 11th, 2013 at 04:06 PM |
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I recall the workshop manual stating to use a ream not a hone. But should be able to hone with the correct type of hone.
like this one.
http://www.youtube.com/watch?v=cUWmUDmGDBw
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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Jimmy Wackburns
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| posted on July 11th, 2013 at 06:18 PM |
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Thanks Vlad,
My hone isn't as high tech as the one in the clip. Have talked to a couple of V8 engine builders and they both say don't use a reamer. Are there any
VW engine builders who use a reamer for this job?
Cheers Jimmy.
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 matberry
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| posted on July 11th, 2013 at 06:56 PM |
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Ask Dangerous but I believe it's a machine only type of job, is for me anyway. Definatey a honing operation.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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vwo60
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| posted on July 11th, 2013 at 06:59 PM |
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Take the rods to a machine shop that pin bored them, usally do both ends so it corrects any difference in the centre length, this is how Crankshaft
Engineering does them in brisbane
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ragged
A.k.a.: David
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| posted on July 11th, 2013 at 11:32 PM |
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The gudgeon pin on a VW fully floats in the small end, which is why you have a (bronze) bush to "ream".
The other type, which is what the V8 guys are talking about, is where the gudgeon pin is pressed into the connecting rod small end.
In this case, it would need to be "honed" as there is no bush to "ream".
Dave
| Quote: | Originally
posted by Jimmy Wackburns
Thanks Vlad,
My hone isn't as high tech as the one in the clip. Have talked to a couple of V8 engine builders and they both say don't use a reamer. Are there any
VW engine builders who use a reamer for this job?
Cheers Jimmy.
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dangerous
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| posted on July 12th, 2013 at 05:26 AM |
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Most VW bushes have about 0.5mm to remove, so really need to be bored to size.
A high quality hone machine (like a Sunnen) can acually do it,
but you have no control over the length, so each rod will likely be a different length.
Also the alignment can be difficult to maintain.
Crankshaft engineering have a Berco brand, rod boring machine that is perfect for that type of job.
It bores the holes so they are parallel , and equal length.
Their machine can bore the exact size needed,
but some shops may finish the size with a hone
if they can not get the accuracy any other way.
07 38067488
You want about 1/2 thou clearance.(five tenths of a thou)
| Quote: | Originally
posted by westi
That's mad Alan.
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