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Kevins 930

Spring Time Woes

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Just dug out my 930 for a first run out this summer, and after a good 20 or so miles to warm up I realised that I have no turbo boost, the beauty runs rather like a VW Polo 1.1 !!!

 

Was all ok when put to bed last Autumn and has been run every month over winter.

 

any ideas please ?

 

Happy lockdown

 

K

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Posted (edited)

Ah what a shame - I get you were looking forward to a bit of boost!

What have you checked so far?

Is there absolutely no boost or just very little? Any funny noises? If a boost pipe has come lose you would hear it so if there are no noises then I'd remove a boost pipe near the turbo and check its still spinning freely.

Edited by jevvy

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Posted (edited)

I’d also check the O rings at either end of the pressure pipe between the turbo and intercooler. The bottom one gets pinched really easily and splits. When this happens the motor runs fine off boost but just doesn’t generate any boost. This would be the first and easiest thing to check.

David 

Edited by flatsix777

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Guest Kev

Thank you folks,

 

Jevvy on the money, absolutely no boost at all, no funny noises either and flatsix777 supplies some useful tips also. flatsix mentions pressure pipe between turbo and intercooler, what sort of diameter are we looking for ?

 

I will have a look in the morning as I have my TR6 on the ramps this afternoon fixing an exhaust manifold leak.

 

No one has touched the car since service 20 months ( 50 miles) ago

 

Thanks very much

 

 

 

 

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58 minutes ago, Guest Kev said:

. flatsix mentions pressure pipe between turbo and intercooler, what sort of diameter are we looking for ?

There are 2  ‘O ‘ Rings, one large (intercooler) and one a little smaller (turbo).  Matt sells the large one and possibly the small one too.

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.mobile/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/6996

You need to remove the intercooler and then the aluminium pressure pipe, which connects to the turbo, pulls out. It’s a tight squeeze so usually needs some jiggling and, ideally, a few things loosened to give you a few mm of play. 

David 

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I have just carried out the rag up the pipe diagnosis, I dont think it has given a clue. Put rag in tube, started engine let it idle revved a little and rag still in place. At tick over speed I removed the rag and placed hand over exit and there is no pressure at all.

 

I did notice however that when I turned engine of there was a clack clack sound that seemed to emanate from the turbo area.

 

Any further thoughts before I strip out a few bits ?

 

I assume to expose the turbo rotor to see if it rotates is a way of understanding if it has seized?

 

Kev

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I doubt that the turbo has seized unless there is a foreign object floating around (seems unlikely if it’s just sat). To check I think you’ll need to remove the silencer (and rear bumper etc). I think you’ll struggle to pull the large hose off the inlet as there is very little room. 

Im not too sure what the rag test was but are all your seals good on the IC and charge pipe? 

The other possible cause would be the wastegate stuck open, although again unlikely, or an exhaust leak in the engine side of the turbo. 

David 

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A few moments with the spanners and I find that the lower O ring ( orange around 45mm dia) is broken and a piece missing. I would insert picture here but I have not a clue how to do it.

 

this could be the issue I am hoping

 

Will keep you informed, but where is best place to purchase a replacement item ?

 

Thanks

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This Is common and is likely the cause. Matt at Type 911 may have one if not OPC. 

I have a serviceable used one which I’ll post if you PM me your address. Will be fine until you next take the IC off. Use a little grease when refitting and loosen the pipe that’s sits right next to the charge pipe; less chance of pinching it.

David 

D57C608F-A274-4EF1-B896-20FC0CBFAD4D.thumb.jpeg.086a069bbcd92f6b71eeb20ec85449be.jpeg

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Thank you very much indeed Sir, I will PM my address.

 

Meanwhile am polishing all nuts and bolts ready for re assembly

 

BTW reason for various guises is that this forum keeps telling me my password is wrong, I change it to a new one and then the same again !!

 

Kevin 

IMG_2172[1].JPG

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Fitted replacement lower O ring supplied very kindly by a forum member, but still NO turbo boost at all. The O ring was broken so now I know its intact.

 

Maybe waste gate issues then ??  

 

Any more ideas folks ?

 

Just one thing, when I shut down the engine I hear from the turbo area a "clack-clack" rather like someone knocking pieces of hard wood together......

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3 hours ago, Kevins930 said:

Just one thing, when I shut down the engine I hear from the turbo area a "clack-clack" rather like someone knocking pieces of hard wood together......

It’s a shame it wasn’t an easy fix. 

The turbo shouldn’t make any noise as you shut down so maybe best to inspect. I think you can just about inspect the intake turbine by sliding back the large black hose on the left. You can probably check if it’s binding. If so the problem will likely be with the exhaust turbine though so you’ll need to remove the silencer. 

F1B42173-E0AE-4FCA-A037-06CE37506536.thumb.jpeg.b43ab312638207700fe463ecb78aa2dc.jpeg

07FF2448-7B36-4E25-B0AA-66E750B9B67D.thumb.jpeg.d84fc1e1d7f5599a1e98f43bcb980b66.jpeg

8829D918-7BA7-43A2-92AB-1F95C51092A0.thumb.jpeg.86e7042e302eb04bc77914d99068846e.jpeg

David 

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The wastegate valve would need to jam open to stop boost building. Hopefully you can just see the valve below (bottom between the four studs. The diaphragm works against the spring as boost builds allowing the exhaust gases to open the valve. 

47CEBDD9-9FA9-4F3B-B6D5-766565E0B177.thumb.jpeg.9113846d1d47c4b1ce7338ce438e33b9.jpeg

Diaphragm with the alloy cover removed. 

45D3B632-DE79-43A5-9D4B-60D76D89C75C.thumb.jpeg.b849351512636b5e76cd23f69ba3f4f6.jpeg

David 

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The only other thing I can think of that makes a noise is the recirculating valve which closes as the throttle shuts. It’s in this housing. 

68AAAA03-6B9A-4C76-A3CA-37C26150C4FD.thumb.jpeg.5b5c17d7f609dafe59a236629b436e72.jpeg

Which is here on mine:

348704A2-49C8-4EF2-AA93-01ED8ABE5857.thumb.jpeg.93c0570c783c380c8c5b67347edcfb27.jpeg

A piston & spring sit behind the small alloy cover near the coil. The piston seats against a nylon seal which breaks down. I had to replace mine to get rid of a slapping noise. Won’t stop boost building though. 

Here is the seal:

5DE1EFAD-3232-4D12-BFA4-709A06284F49.thumb.jpeg.daf2c5397362caa55c5abd3a0869bd4b.jpeg

Are you sure all your intake seals are good (to IC and IC to throttle body). It’s odd it was fine and then happened after standing. That would usually point to something simple. 

David 

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Gosh thank you so much for detailed appraisal, I have a couple of days being tied up right now but can get to it at weekend.

 

I am also of the view that as this was after a winter lay up it is probably something "simple"

 

More investigations to follow.

 

Best wishes

 

Kev

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