All Things Mk5 > How to Guides / Troubleshooting
One reason why fuel-rail pressure may be low....
ROH ECHT:
That is another good idea for checking cam lift.
One would only need to measure depth and then rotate the engine to measure the two spots required to figure the lift...thank you.
With a sturdy bit of straight edge to span the HPFP opening, one could use the depth-end of their typical/std calipers;
rich83:
A proper depth micrometer would work better. Good idea pudding. I would think measuring off that face would be fairly accurate.
G-olf:
Do you guys mean a dial gauge? mounted where the pump fixes, then through the hole where the plunger goes. Turn the engine by hand, watch the dial move as it follows the cam lobe?? Therefore measuring the lift on all 3 lobes
pudding:
Yep. Although most dial gauges have a magnetic base, so you might struggle to find enough steel in the area to mount it to. Although, I suppose you could gaffer tape it to the rocker cover!
We're only looking for mm measurements, not 1000th/s of an inch, so any old cheap gauge/caliper should do the trick.
I'm not sure how thick the DLC coating is on the follower, but once that's all worn off, that won't be helping with the pump lift either.
It's clearly a very sensitive setup if 1mm wear is enough to cause fuel pressure drops. You would therefore hope the chain cover is a consistent and accurately machined part on all engines, hence using it as a reference point :happy2:
I suppose you could even drop a brand new follower down the hole and just stick your chosen measuring device into that, then rotate the engine and note down the lift on each lobe. Even easier!
adamvaughan:
What sort of mileage would you expect the cam follower (and other parts?) to last for? My BWA engine has done just over 56k and I doubt it's ever been replaced.
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