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  1. #1
    New Member
    Join Date
    Jul 2006

    Default 51 to-30 missing thrust washer

    I was changing the oil in my 51 to-30 with continental z129 engine and found metal on the magnet. The metal is from the crankshafts hitting the front main bearing cap as the thrust washer is gone.the main bearing is still firmly seated in the main cap.should I go with a flanged main bearing or the thrust washer. Do I need to worry about the scored main cap.I am going to put all new bearings in and have the tractor split,will the bearings be stamped as to if they are standard or. 10,.20 and so on.from what I have seen so far there is no scoring on the crank or the one main bearing I took out.any help would be greatly appreciated.


  2. #2
    Gold Member
    Join Date
    May 2012
    Gidgiegannup Springs, Western Australia
    Massey Ferguson 148 .Chamberlain Super 70. Caterpillar D4. Chamberlain 354 FEL.Toro 268 rideon kubota L2002fel

    Default Re: 51 to-30 missing thrust washer

    G'day isie.
    I am not 100 % sure what you are saying ??
    The thrust washers have fallen out,if so this is caused by the operator driving the tractor with his OR HER foot resting constantly on the clutch pedal and eventually wearing the crankshaft thrust bearing down thin enough that it falls out and when the rear thrust washer falls out this will allow the front thrust washer to fall out then the crankshaft will contact the front main bearing cap, normally you would feel the clutch pedal loose and it sometimes shudders as the crankshaft GRINDS the front bearing cap.

    To repair the problem .
    Providing the crankshaft,main bearing and engine block thrust surfaces are serviceable it could be as simple as measuring the TOTAL FREE PLAY of the crankshaft and installing new oversize thrust washers.

    If the engine block thrust surface is damaged it can be repaired by Brazing the damaged surface and re machining back to the standard dimension ,this I would say is better done by a machine shop with the specialist knowledge and equipment to complete the task.

    New crankshaft and connecting rod bearings are supplied with the journal size stamped on the Back of each shell Be it STD (standard) or + 10+ 20 + 30 etc, check the size of the bearings that are removed and I would also measure the Crankshaft Journals to be sure, mark or make sure the caps are refitted in the same journal and the correct way as they were removed.

    If as you say the engine will be removed from the tractor ,Which in my opinion would be the way to go, You would be wise to check the condition of the clutch , Replace the Front and Rear Crankshaft seals, It may also be a good time to have a look at the engine lube oil pump.
    That,s all I can offer.
    as always .
    Happy Days.

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