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Engine Specific Info and Questions => IDI Engine => Topic started by: gigaz2 on September 10, 2008, 02:31:05 am

Title: IM shaft play
Post by: gigaz2 on September 10, 2008, 02:31:05 am

I can't find the specs for that, how much is too much?

I can feel some, but that's subjective..

when I took the IM shaft out this is what I found:

(http://naotefiques.no.sapo.pt/DSC01828.JPG)

the bearing surface is scratched, bu smooth, I can't feel irregularities with my nails, the oil seal surface is a different story, it has those two nasty grooves. the other end looks new.
usable?

Title: IM shaft play
Post by: gigaz2 on September 10, 2008, 03:42:49 am

just dropped it at the machinist to lighten it up, I'll go there again to see what they can do about those grooves, and drop a few more parts

Title: IM shaft play
Post by: gigaz2 on September 10, 2008, 08:42:05 am

thanks, but what about the play? how much is OK?

Title: IM shaft play
Post by: Quantum TD on September 10, 2008, 05:50:37 pm

Quote from: "gigaz2"

thanks, but what about the play? how much is OK?

No specs for you, but in out (pass side to driver's side) play is normal. Up/down play should be non-existent. If you have up-down play, then you'll need to get oversized bearings and ream them in-place as libbybapa noted.

Title: IM shaft play
Post by: burn_your_money on September 10, 2008, 06:35:19 pm

Bentley specs 0.25mm (0.0098in") for axial play on the 1.6s. I believe it is even more on the AAZs but that bentley is at work right now so I can't check.

Title: IM shaft play
Post by: gigaz2 on September 11, 2008, 02:59:36 am

thanks a lot! I'll measure it asap.

I see I must get a bentley :( I already have Chiltons, and haynes (mk2 and mk3), but both are almost useless for anything more than an oil change.

Title: IM shaft play
Post by: gigaz2 on September 11, 2008, 05:25:08 am

well, I realized I couldn't measure the play because I already had dropped the IM shaft at the machinist yesterday...

but, this is what I got today:
(http://naotefiques.no.sapo.pt/DSC01831.JPG)

going to measure play now.

Title: IM shaft play
Post by: gigaz2 on September 11, 2008, 06:02:29 am

wohooo!!! 0.14mm of side to side and up-down play, measured without the outer plate and seal.
not very good, but acceptable.


also took out the seal, I don't like this design, we have 1cm of sealing surface and the seal only contacts in one point.
thats why I had a groove on the outer seal.