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Old 08-11-2018, 03:51 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, 02:00 PM   #2
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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, 03:01 PM   #3
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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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Old 07-01-2019, 12:18 AM   #4
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Default Re: HPOP a warning (Fuel pump bolts)

Hello Dennis!

I had this exact issue happen to the engine you swapped out for me back in July of 2017... The Bolts fell out, in May last year with only 5k on the engine, we spoke a bit about this issue and unfortunately, you weren't able to cover it.

The pump fell almost all the way off, and in the process tooth a few teeth off of the gear attached to the cam that drives the pump. Do I need to worry about metal in the cylinders, or bearings? So far an engine oil check didn't detect any metal particulates.

Might you be able to let me know what this would entail, cost, labor etc? Can I just swap out the Gear at the end of the cam and swap the pump out, with proper bolts, and do an engine flush? Or am I looking at an entire rebuild on this engine?

Thanks.

Joshua

Last edited by Joshuaam; 07-01-2019 at 01:21 AM.
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Old 07-01-2019, 12:36 AM   #5
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Default Re: HPOP a warning (Fuel pump bolts)

Quote:
Originally Posted by lindenengineering View Post
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
Dennis, what's the torque spec on those bolts? Should one consider replacement at a certain mileage? 200k?
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Old 07-06-2019, 10:03 PM   #6
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Default Re: HPOP a warning (Fuel pump bolts)

Eighteen NM. (new sticky bolts)
(18 NM)
Dennis
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Old 07-23-2019, 03:10 AM   #7
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Default Re: HPOP a warning (Fuel pump bolts)

"check yours every so often", should I just try to torque them to 18 NM and if they turn replace them (torque them down with blue loctite as a patch until I get my hands on a set of new)?
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Old 08-18-2019, 07:08 PM   #8
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Default Re: HPOP a warning (Fuel pump bolts)

Is it possible for anyone to post a photo of the pump & 3 bolts so we know what we're looking for? Does anyone have an opinion whether this is an issue on a 2018 engine? Thanks!
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Old 08-20-2019, 05:34 PM   #9
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Default Re: HPOP a warning (Fuel pump bolts)

Its not an issue!
This Bosch HPOP pump is used on numerous applications with the same 3 fixing bolt patterns , its not unique to MB !~
The issue is that people think its a 6mm bolt, and./or an American factional size bolt and do not realize its one time use sticky 7mm x 1 bolt ONLY available from MB for MB applications.

I posted the info to draw attention of this fact for the DIY'rs and the YouTube Grads to this forum.
Dennis
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Old 08-20-2019, 06:37 PM   #10
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Default Re: HPOP a warning (Fuel pump bolts)

Thanks Dennis. I just can't tell which 3 bolts I am looking for so I can keep an eye on them.
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