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HPFP Parts Identifier

4618 Views 6 Replies 5 Participants Last post by  dweisel, 
D
2
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!
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chittychittybangbang
Larger pics? I only see a thumbnail. If you click on your profile there's a user album where you can upload pictures.
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D
James, that is a wonderful pictorial view!
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L
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.
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longo said:
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.
Click to expand...
It's labeled pump drive shaft w/cam. You can see how the part at lower right goes into the hole on the pump.
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L
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.
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longo said:
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.
Click to expand...
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.
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