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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Thu Jul 07, 2022 13:15 Post subject: 4m40 diesel pump rebuild required.. ouch£! |
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Hi all,
Just heard back from Diesel Bob regarding state of the diesel injector pump, and it's not good news!..
Following bench test: major issues with pump - very poor suction, excessive mid range delivery, discoloured fuel from pump return.
Inspected internally and found to be contaminated with engine oil and signs of rust.
Advised pump rebuild required.
Full rebuild of pump Inc new vane pump, test & calibrate - £428 plus vat... Ouch!
Plus injectors rebuilt - £192 plus vat
It's been an expensive couple years with the Delica and as mentioned above I am in the middle of the second head replacement!
The advice I am after is:
1.Would anyone agree with me that the faulty diesel pump could have caused the engine to overheat and crack the head again?
2. Has anyone else had a diesel pump rebuilt... Is it worth it!? Or...
3. Would I be best to try and source a good second hand pump.. obviously I then take the risk!
Any advice or opinions greatly appreciated! |
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Posted: Thu Jul 07, 2022 13:15 Post subject: Google Ads keep this community free to join! |
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Lewis Site Admin
Joined: 25 May 2006 Posts: 16296 Location: Huddersfield
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Posted: Fri Jul 08, 2022 10:42 Post subject: |
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A faulty fuel pump would not cause overheating.
That is down to a fault in the cooling system or a fault in fitting the head. such as :-
1. Overtightening of the head on fitting.
2. Fitting the wrong sized gasket.
3. Fitting a crappy gasket or a gasket with a faulty channel seal in it, that allowed a gap to form between the water channel and piston cylinder. _________________
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Mon Jul 11, 2022 20:03 Post subject: |
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Thanks for your reply Lewis
Appreciate your advice regarding the faulty fuel pump, but would you agree incorrect calibration of the pump causing it to over fuel cause overheating?
Regarding the cooling system/fault with fitting head - the entire cooling system was either replaced/checked including new rad, stat, water pump flush etc and the head was fitted to Manufacturer spec in terms of procedure and torque settings etc.
Here's hoping it was due to an aftermarket gasket (was a four notch) - am waiting for the new genuine Mitsubishi head gasket (3 notch - correct for engine) and reconditioned fuel pump and injectors to arrive.
Will keep you posted on the rebuild!
Thanks again |
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andyman
Joined: 08 Dec 2012 Posts: 5602 Location: Penrith
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Posted: Tue Jul 12, 2022 18:36 Post subject: |
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Never heard of overheating as a by-product/symptom of over-fuelling, which generally leads to excessive black smoke and fuel consumption. A diesel engine will only burn as much fuel as it is getting air for, the rest will be sent out of the exhaust as partly burnt fuel which is black carbon particles and CO2 and unburnt fuel - hence a strong smell of diesel. An over-boosting turbo is more likely to cause overheating. The only part of the cooling system you will not have been able to renew is the cylinder block. Like the head, the narrow channels in it fur up with rust, reducing flow through the engine if correct coolant mixture has not been maintained. Definitely worth checking the state of these when you take the head off next. _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Tue Jul 12, 2022 21:28 Post subject: |
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Many thanks for your good advice.
Yes I have checked and cleaned out the waterways as far as possible in the block,
Just waiting for the genuine head gasket to arrive now so I can start putting it back together....
And then blow off on an overdue coast camping tour of Wales! |
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andyman
Joined: 08 Dec 2012 Posts: 5602 Location: Penrith
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Posted: Wed Jul 13, 2022 9:02 Post subject: |
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Coastal tour of Wales is on my trip list too (missing out the tourist colonies of the north coast!) With a few in-land detours too. OOPs, sorry - off topic! _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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