Rattle from gearbox at low rpm?

[axels]

Lads,

looking for your help here - my Boxster has developed a slight rattle from the engine bay which only occurs at around the 1000 rpm mark especially if asking for torque (i.e. accelerating in town in 4th). Have not had this on the Boxster before but it reminds me of an unsynchronised set of gears as experienced in Mk. 1 Elises. All is well at higher rpms. This is the first gearbox on a 63k mile 2002 non-S.

Do I need to get myself on the OPCs calender? Am I in for a new gearbox?

[wildoliver]

Could be the guide tube, or does anyone else suspect dual mass flywheel?

[Gaity]

Could it be engine knock from low octane fuel or an ignition problem? Accelerating from low revs, in a high gear could be asking a bit much of the fuel/air mix in that case.

[axels]

Gaity said:

Could it be engine knock from low octane fuel ... ?

I think I can rule that out since it happens independent of whether I go for 98 or 95 octane.

Also, I'm not sure how engine knock would sound - the rattling does have a rather mechanical sound to it

[Gaity]

axels said:

Gaity said:

Could it be engine knock from low octane fuel ... ?

I think I can rule that out since it happens independent of whether I go for 98 or 95 octane.

Also, I'm not sure how engine knock would sound - the rattling does have a rather mechanical sound to it

so does engine knock - just a thought.

[pikey]

Oh completely standard.

They have a fix - talk to your OPC.

I think more details are something like "car cold, engine at 2,400 rpm".

It's a tiny ball bearing that's the wrong size. Absolutely no problem. Fixed under warranty.

I'll see if I can dig out the Porsche reference bulletin....

[pikey]

Nope, sorry - must have deleted it.

Your OPC will know.

... so do a lot of people on Boxa.net

[sportsandclassic]

Hello

Try pushing the clutch down and reving car up then see if it does it if not then gearbox is cause if it still the same then its not the gearbox...if it is all parts are available for the 2.5 and 2.7 litre gearboxes as they are audi gearboxes.

Probably the oil pump relief valve is chattering think this was a recall from opc....just worth a check.

Thanks


mike

www.sportsandclassic.com

[pikey]

sportsandclassic said:

Probably the oil pump relief valve is chattering think this was a recall from opc....just worth a check.

THAT'S THE ONE! It was the ball bearing on the spring on the pressure relief valve!

[thong]

sportsandclassic said:

Hello

Try pushing the clutch down and reving car up then see if it does it if not then gearbox is cause if it still the same then its not the gearbox...if it is all parts are available for the 2.5 and 2.7 litre gearboxes as they are audi gearboxes.

Probably the oil pump relief valve is chattering think this was a recall from opc....just worth a check.

Thanks


mike

www.sportsandclassic.com

mike hi m8 boxster s gearbox rebuild you did fine now m8 thanks,had the car back in last week for a major service all dry no leaks from trans,discount on next one for good words :-)

[sportsandclassic]

Thanks mate ill discount next 1 yes thanks for positive feedback...


mike

[axels]

Thanks for all your suggestions - based upon the feedback I had the car checked out by the OPC and it turned out to be loose heat shields rattling against the exhaust or cat - fixed in a couple of minutes at 50 euros.