951 GTX DI Air Compressor Rebuild - Revisting

[DI_Hoss]

Hey all 951 DI lovers!

I try not to start duplicate threads, but the 951 DI air compressor thread has gone a little stale, and I haven't been able to find what I am looking for on the air compressor - talk about the compressor head itself.

I'm rebuilding my 2002 GTX DI 951 engine and one of the things I see people say is to rebuild the air compressor while it's out. Ok, good and fine; but the rebuild kits our there are for the compressor piston, sleeve, rings, rod, etc. What about the rebuilding the head? Does the reed ever fail, need to be replaced? I have yet to find someplace that has the compressor head parts.

Thanks in advance for the thoughts. @etemplet - you have a couple of old threads - what were your findings?

Cheers!

 

[etemplet]

You can take the head apart and change the components if they are damaged but I have never done that nor have I searched for replacement parts. I've had to buy a head off Ebay because one was missing and that one worked fine. I just give it all a very close inspection. I pay a lot of attention to the oil check valves and drain fitting at the bottom of the compressor.

 

[DI_Hoss]

Thanks Gene - you've seen and posted quite a bit about these dinosaurs - and it is much appreciated!

 

[etemplet]

Thanks Gene - you've seen and posted quite a bit about these dinosaurs - and it is much appreciated!

I learned a lot from people on this board and just sharing as they do. Good Luck !!

 

[Mark93]

Hi guys, on the topic of air compressor overhauls… I’m trying to do it with my 2002 GTX DI engine still in ski but manual states I have to take flywheel off to gain access to the con rod bolt… has anyone done this without removing the flywheel? I’m very cautious to not break anything by being heavy handed

 

[etemplet]

Remove the jet pump and flywheel. No other way to remove the cover with the flywheel in place.

 

[Mark93]

Remove the jet pump and flywheel. No other way to remove the cover with the flywheel in place.


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View attachment 67276Wow! Very bad day in the office there! What happens to it??

 

[Mark93]

Wow! Very bad day in the office there! What happens to it?? **

 

[etemplet]

Wow! Very bad day in the office there! What happens to it?? **

The Tygon I bought wasn't true Tygon tubing and it deteriorated so the compressor wasn't getting oil from the injector pump. Lucky for me it was the only line that fell apart. I spent a long long time getting it spotless inside. I always check the lines before I install them but from this episode I started testing the lines by cutting a piece and inserting it in Laquer Thinner for 10 to 15 minutes.

 

[Mark93]

The Tygon I bought wasn't true Tygon tubing and it deteriorated so the compressor wasn't getting oil from the injector pump. Lucky for me it was the only line that fell apart. I spent a long long time getting it spotless inside. I always check the lines before I install them but from this episode I started testing the lines by cutting a piece and inserting it in Laquer Thinner for 10 to 15 minutes.

I just had to take a dive into what tygon was haha.. fuel resistant PVC tubing of sorts? …

I replaced my oil tubing with some off eBay.. really hope that doesn’t come back to bite me haha… on another note I took the head of the compressor off and noticed the reed valve suction sealing face had a small amount of corrosion, do you reckon this could cause me not to get required pressure?

 

[etemplet]

Depends on the pressure you're seeing. Did you check the o-rings on the fuel rail? Leaks on the line going into the rave solenoid? Are you getting 27 psi at key on?

Just looking, difficult to tell if that is your problem. The ski will start without the compressor working properly but it will only idle. This isn't an absolute but has been my experience.

 

[Mark93]

Depends on the pressure you're seeing. Did you check the o-rings on the fuel rail? Leaks on the line going into the rave solenoid? Are you getting 27 psi at key on?

Just looking, difficult to tell if that is your problem. The ski will start without the compressor working properly but it will only idle. This isn't an absolute but has been my experience.

Yes, I get 27 psi on ignition then when starting the pressure fluctuates massively between 60-80 psi… misfires and dies shortly after

 

[etemplet]

Check for air leaks. Block of the line and see how much the pressure rises. You need 107. I connected a air hose to the fuel rail and pressured the system. The engine ran fine. Good Luck !!