Crank no start

JUDDA

MEMBER
1992 MITSUBISHI PAJERO
2.5L
4 CYL
TURBO
4WD
AUTOMATIC
10,000 MILES

Have the vehicle listed above it is a diesel with a 4d56 engine. I am having a problem with the auto gearbox.
So I have purchased another with a good gearbox but a damaged cylinder head same engine.
Swapped the head over carefully ensuring all the connections etc, were put back together correctly but now the car will not start.
It is turning over but not making any attempt to start no emission from the exhaust checked the injectors and fuel is spraying out when turning over.
Any advice on what could be the issue would be greatly appreciated.

9 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Have the engine compression tested. For diesel engines, low compression would result in no start. Check the glow plugs to see if they are working. Bad glow plugs would result in difficult starting.
Has the fuel system been fully bled of air in system?

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Thursday, November 2nd, 2017 AT 8:01 AM

JUDDA

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5 POSTS

Thanks for the information. The glow plugs have been tested and okay I tested the compression and the readings twelve bar on three of them ten bar on one.
Not sure how to bleed the fuel system of air. Please could you advice me how to do this?

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Thursday, November 2nd, 2017 AT 10:34 AM

KHLOW2008

MECHANIC
41,814 POSTS

Prime the fuel system by pumping the manual hand pump at fuel filter until the knob becomes stiff, indicating pressure.

Loosen the nut holding the pipe to the injectors and crank engine until fuel spurts out and re-tighten the nut. Ensure battery is strong as a faster cranking speed would enable initial starting.

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Thursday, November 2nd, 2017 AT 8:03 PM

JUDDA

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5 POSTS

Thanks so much for the great information which is really helpful. Going to try tomorrow and will let you know what happens.
Many thanks.
Judda

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Friday, November 3rd, 2017 AT 10:53 AM

KHLOW2008

MECHANIC
41,814 POSTS

You are welcome.
By the way it might take some cranking before it starts if air is trapped in system.

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Sunday, November 5th, 2017 AT 11:25 PM

JUDDA

MEMBER
5 POSTS

Hi Mate no joy took the bad cylinder head valves out yesterday and there is massive damage to the face with a inch hole in the face but also the valve seating next to it was destroyed could the debris got into the block causing the low compression.
I was trying not to have to swap the whole engine that's why tried using the good engines head cylinder but now thinking of putting that back on the engine I took it off which is a runner and swapping it as I think that the block I put it on may have internal damage as it overheated.
Any comments suggestions would be most welcome and many thanks for your help so far.

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Monday, November 6th, 2017 AT 10:41 AM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

Wow that is some damage there. I would inspect the piston and cylinder walls for damage. It might be time for a different engine.

Please let us know what happens.

Cheers, Ken

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Thursday, November 9th, 2017 AT 11:54 AM

JUDDA

MEMBER
5 POSTS

Hi Ken
I agree that must have caused piston /cylinder damage we tried to put the good head on the engine that overheated as a quick fix but obviously that has not worked so going to take the whole damaged engine out and put the head back on the one I took it off which is a runner so much for cutting corners but learning all the time will let you know how it goes
Cheers
Judda

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Friday, November 10th, 2017 AT 10:38 AM

KEN L