Posted by GUI|BAD_CO. on December 20, 2012 at 20:13:05 from (66.168.16.55):
Good day all. I was a registered members years ago but i couldnt remember my user name so i have reregistered to post this information to the forum so perhaps i can save someone alot of time and money.We have 3 MF65's. A loader tractor which has been running great for 7-8 years after having the motor and head rebuilt. Had to have a head redone on another 65. Head was returned and i installed it. Within 20 hours i heard a nasty clattering and shut her down promptly. Pulled off the valve cover to find a missing valve. You know where that was eh? Machine shop claimed the valve keepers were incorrect or inferior. When viewing them you could see they were not inplace the way they should have been. Pull the head to return it to the machine shop and find missing valve.Its half embedded in cylinder wall with a hole in the piston. Tear down tractor to send engine in for rebuild also. Send all back to machine shop where problem started.(Not my idea)Dads recommendation. 4 weeks later everything is done and i install. Between 50-100 hours the tractor is running like S**T and popping through the intake. Hmmmm. What could cause this? Remove valve cover to find burned valves. Shop says valve guides must be bad. Remove head and send it back. Explain to Dad there is a descrepency between the manual and the IT book as to the direction of the oil holes in rocker shaft.(Little attention payed to this remark as it must be valve guides.)Uhh Huh. Ok. (Rebuild at their cost except of course for my time and a gasket set.) I did not return the rocker assembly to them. Next spring i reinstall rebuilt head. Heres comes the unexpected. Between 50-100 hours the tractor is running like S**T and popping through the intake. Dads favorite machine shop is out of business. Pull valve cover and rocker arm assembly off of old 65 that hasnt been run in years because of needing a hydraulic pump and me not having enough time to put it back together. Engine and head were redone just before my Dad bought it. Competely rebuilt by a VOTECH school. Rocker arm assembly shaft oil holes point toward the valves just as IT book says and just as the 1st machine shop i sent the assembly too had it positioned. Why are valves on this rebuilt head also loose enough to wiggle when moved with my hand though? Hmmm. Seems odd it needs a valve job after less then 300-400 hours. I take the head to a large tractor trailer shop along with my manual and IT book and show the head man the differences between the two but no conclusion was reached. Head is sent out to their master rebuilder. Head is returned and i install it. Set valve lash as usual and observe the amount of oil being splashed about as it runs. Seems to me that many years ago when i had done the loader tractor there was considerably more oil then this splashing about.Blah, Blah, Blah! Valves burn. Return to rebuilder. Rebuilder wants to see rocker arm assembly. Ok. Rebuilder then wants to see rotator caps. Ok. Rebuilder fixs head at his cost. Pull valve cover and run the loader tractor and watch oil spraying everywhere. Pull rocker arm assembly off of loader tractor to find orientation is completely backwards in comparsion to others. Consider the fact that the 1st machine shop rebuilt, or at the very least reassembled the rocker arm assembly shaft backwards.The 2nd machine shop after inspecting it didnt know it was backwards.The IT book installation instructions are backwards. The VOTECH school must have used the IT book so my other 65 was backwards and is need of a valve job....Conclusion:.... WARNING! DANGER! Do not install the rocker arm shaft so as the holes point toward the valve springs. The IT manual is incorrect and it will cost you another valve job in less then then 100 hours as the valves guides will burn from loss of oil lubrication and heating. THE HOLES POINT TOWARD THE PUSHRODS. Learned from this? Older and wiser,is at times wrong.
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