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Minneapolis Moline Tractors Discussion Forum
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RTU Engine Compression Results

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Jim/41_9N

04-06-2007 09:11:19




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Just finished a compression test on the RTU. This tractor as far as I can tell has a stock motor. It has been a farm tractor all its life. First I warmed up the motor, then pulled all the plugs and set the throttle wide open. Following is the results:

Dry
#1 - 70, #2 - 80, #3 - 85, #4 - 82
Wet
#1 - 80, #2 - 84, #3 - 90, #4 - 86

The motor starts easily, and runs pretty good. Just trying to get an idea about the numbers. They seem a little low to me. All the spark plugs were somewhat fouled, though I have no idea how long they were in. Any thoughts?

Jim

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Jim Parisot

04-07-2007 08:34:02




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 Re: RTU Engine Compression Results in reply to Jim/41_9N, 04-06-2007 09:11:19  
Jim/41 9N, yes the numbers are a little low, but depending on what you are going to do with the tractor, a fresh set of hotter plugs may be all you need. Usually on the R's and Z's lowered compression indicates a need for a valve job (and they all seem to need it). A heavily advertised feature of these engines is that you could grind the valves and valve seats with the blocks still on the engine, just take off the head and side covers and stuff rags down the bores and have at it. They also said you could overhaul the engine sitting on a milking stool and I have found myself usually sitting on an upside down 5 gallon bucket working on these things. I have an RTU with similar compression to yours and I have plowed with it with 2-14's and it has enough power to just barely lift the front end off the ground in second gear when the going gets tough. I think that speaks pretty well for the power it still has. Of a little suspect is your #1 cylinder, it is lowest on compression and jumps the most with oil added, but I don't think I'd go to all the work and expense of pulling the blocks and honeing it and new rings, or maybe a rebore, for that little of a compression drop. I think a valve job at most should be sufficient. You could even change out the valve guides if you thought it necessary. You may not know how it's been used in it's later life either, maybe the plugs are fouled because it has just been idling around or used on light loads. If I were you I'd change plugs and get it on a good pull for a while if possible and see what happens. Most of these old tractors are never going to be really worked anymore so we have to do that balancing act of time and expense vs. ultimate use/needs/desire. Hope this helps.

Jim

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