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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF 135 - think i have blown a piston

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Martin from Sus

06-25-2007 09:53:30




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Only semi competent with spanners! Is there anything to be careful of when removing the head/block to check for damage?




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DavidP, South Wales

06-25-2007 13:43:56




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 Re: MF 135 - think i have blown a piston in reply to Martin from Sussex, 06-25-2007 09:53:30  
Hello Martin,
First of all are you able to start the tractor?
Faulty injectors happen occasionally so it might be worth finding which cylinder is faulty and then changing the injectors. If the problem stays then your injector is OK. Diesel repairers do not normally charge for testing injectors. If so start it and slacken each injector mut off in turn. The one which has the least effect on the engine will be the one where the problem is.
Going through the procedure;
Remove the bonnet and fuel tank (preferably when empty)
Remove the rocker cover. Undo the oil feed pipe from the rocker gear and also undo the pipe underneath from the cylinder head to the engine block. Starting in the centre work outwards in increasing circles and slacken a little at a time in 2 or three stages. A problem that you may encounter is the rear left stud. You will see that the hole in the head is larger. This frequently fills up with carbon and can be a B****** to get off. Without bending the stud the only way to remove the head is to insert thin packing strips to start a see-saw action and increase the thickness as the head starts to rise. When the head is off there are several possibilities;
The valve stems can be heavily carbonned and preventing the valve/s from closing.
The valve seats can be worn or burnt.
The head can be cracked.
Turn the pistond to bottom dead centre and check the bores for any scoring or marks and cracks in the liners.
Look for any burning or excessive piston slap.
Please let me know what you find.
Regards
DavidP, South Wales

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