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Old 08-11-2018, 02:51 AM   #1
lindenengineering
 
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Default HPOP a warning (Fuel pump bolts)

The HPOP that triangular looking casting hanging off the front of the driver's side cylinder head!
HPOP in fact a term used in the trade for the high pressure pump feeding the fuel system .

Its held onto the head by three (3) 7x1mm bolts that are sticky!
So to be used only once! Unless you daub them in blue loctite as a "get me by!!
Failure to check on this pump's security can, and in some situations will cause detachment and camshaft drive gear damage which drives the HPOP pump itself.
Seen two this week!!

This is a royal wallet flush repair so check yours every so often.
Dennis
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Old 08-11-2018, 01:00 PM   #2
Aqua Puttana
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Default Re: HPOP a warning (Fuel pump bolts)

Quote:
Originally Posted by lindenengineering View Post
The HPOP that triangular looking casting hanging off the front of the driver's side cylinder head!
HPOP in fact a term used in the trade for the high pressure pump feeding the fuel system .

....
Dennis
Dennis,
Thanks as always for the information.

Does this apply to both the V6 and I4? Any particular model years seem prone?

vic
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Old 08-11-2018, 02:01 PM   #3
lindenengineering
 
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Default Re: HPOP a warning (Fuel pump bolts)

All on CD14 engines in older 906 Sprinters and a Jeep.

The Sprinter pumps simply came loose and shed their bolts, breaking some off in the head.
The latest I/we fixed yesterday was a simple drill out busted bolts and refit with new bolts.
At 289,000 miles no explanation and the other was at 127,000 miles. Just fell off!
If there was a common denominator then both engine produced a distinct cold start rattle as the timing chain took up.
The other one was simple DIY error.
The Jeep owner had DIY'd the pump, but had simply installed the original bolts--It too fell of taking the cam gear teeth with it!
That was not a cheap job !
Consequently a new shop policy!!
All pump disturbances MUST have new bolts installed.
Dealer didn't have them in stock but I did buy 30 off for future stocking arriving 24 hours later.
Dennis
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