VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum banner

1 - 7 of 7 Posts

·
Premium Member
Joined
·
124 Posts
Below pic: hpfp removed from engine.
1) the large round black plastic cap protects the 6 sided nut on top of the intake valve from being turned.

2) the electric connection on the left is for the fuel metering valve. N290 This valve can be inspected with the hpfp still on the engine by removing two T-25 torx screws. Any metal at the fuel metering valve is signs of a hpfp problem.

3)the shaft toward the front is the cam. A gear is mounted on this tappered shaft. The TB mounts on this gear. Although the TB turns this shaft/cam the hpfp is not a timed pump. All injection timing is done by the ECU and electronic fuel injectors.

4) the cam/shaft is held in place by the front hpfp cover which can be removed by removing 4-T40 torx screws. This cover has a bearing material,seal and fuel lube port for the cam shaft.








I'll be adding to this thread as I have time to post more info and pics.

dweisel
LUBRICITY,LUBRICITY,LUBRICITY!
 

·
Registered
Joined
·
7 Posts
NIce photo, but where's the piece that the cam shaft runs up and down? From what I understand that could be the cuprit that causes the metal particles in the fuel supply and then becomes a WMD.
 

·
Registered
Joined
·
220 Posts
NIce photo, but where's the piece that the cam shaft runs up and down? From what I understand that could be the cuprit that causes the metal particles in the fuel supply and then becomes a WMD.
It's labeled pump drive shaft w/cam. You can see how the part at lower right goes into the hole on the pump.
 

·
Registered
Joined
·
7 Posts
Missing a part

No that's not it.

That indeed is the camshaft that drives the pump assembly. The piece I'm looking for has a roller on the bottom that follows the cam up and down.

I think the part must still be in the bore.

BTW, some now think that the shredded particles in VW's HPFP are very similar to the same wear issues in rack and pinion systems that use an aluminum case.
 

·
Premium Member
Joined
·
124 Posts
Discussion Starter #7
No that's not it.

That indeed is the camshaft that drives the pump assembly. The piece I'm looking for has a roller on the bottom that follows the cam up and down.

I think the part must still be in the bore.

BTW, some now think that the shredded particles in VW's HPFP are very similar to the same wear issues in rack and pinion systems that use an aluminum case.
Here is a pic of the piston cup/roller that runs in the aluminum bore and drives the high pressure piston of the high pressure part of the hpfp. When enough aluminum particles from the bore get fouled in the clearance space between the roller and roller mount it causes the roller to fail.



 
1 - 7 of 7 Posts
Top