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Tractor Talk Discussion Board

Re: Ford 800 Head


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Posted by RAB on November 02, 2008 at 01:03:57 from (64.12.117.74):

In Reply to: Ford 800 Head posted by Homerville Bill on November 01, 2008 at 20:22:04:

My impression of this post is one of near amazement.

Why should you just decide to replace your rings?

You may just want another job to do in the winter months, an exploration job, who knows!

There may be some reason(s) why you think they should be replaced.

From your post you don't seem to have the expertise to do this job effectively.

You will need to dismantle and check all parts for wear, damage and seviceability. There is no point in fitting rings to a bore which will not accept them or to pistons which are unseviceable. You might find, if you look, that the crank is at or near the unserviceable limits of wear. When the head is removed the valves and seats and guides should be checked, measured and reseated as necessary. These are all standard jobs lumped together as the work in doing each separately would be mainly duplication of effort, wasted time and resources. That is, unless they have been done recently. The head surface should not need machining, but you check it and machine if necessary.

Furthermore, you need to know the types of ring that can be used for this purpose. You may need to remove the ridge at the top of the bore, although this often indicates other problems for this particular exercise.

Gas, diesel? Are there other possibilities you have overlooked for the dfciding to replace the rings? Have you carried out a compression test to ascertain differences between cylinders? Is the oil pump, pressure reief valve good? Are main and big end bearings good? If pressure is being lost you need to know where to look for problems and fix them all at the same time -for two reasons - 1) you will be stressing other parts which may be near to failure and 2) you may well be repeating the same dismantling work again in short order.

As other poster suggested, an complete over-haul kit of liners and pistons might be a better route to go. I say find out first and then decide which route to go, but bank on the worst scenario situation and you won't end up trying to cut corners and finish up with a poor or ineffective repair.

Regards, RAB


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