International 685 rebuild engine

[Ed Kratt]

I have an INternational 685 and I think I need to rebuild the engine. The oil light flickers at low RPM after I run the tractor for a couple of hours. Possibly just a new oil pump? Also it is a little hard to start when it is cold. If any one has any thoughts I would really appreciate some ideas. Thanks, Ed

 

[richardinnz]

Hook in a test gauge to see what your pressure actually is, the sender units are the cause of 9 out of 10 suspected low oil pressure indications. If you cant get hold of a test gauge easly, get a replacement sender unit and try it before tearing into the engine.

 

[Ed Kratt]

Thanks for the reply, I had thought of that, I was wondering if it could have been the sending unit, probably not a bad idea to replace it anyway if they aren't to expensive. Glad to hear the possibilty is something other than an oil pump. Thanks again..

Ed

 

[RAB]

OIL PRESSURE: Assuming you have good quality oil of the correct viscosity and that the idle is not too low. Or what do you mean by low RPM? Assuming the pressure relief valve is not stuck or leaking. Assuming the oil filter is not clogged. Assuming the sender unit is good. Assuming the engine is not running too hot. Is the oil pick-up screen clogged? What is the previous history of the engine? Does it burn a lot of oil?

COLD STARTING:Is cold start device working properly. Is battery up to snuff. Is starter turning engine fast enough? Has valve gear been checked for clearances. Has a compression test been carried out? Have injectors been cleaned/overhauled/reset or checked for pop-pressure and spray pattern?
How 'cold' are we talking about? What is a 'little' when referring to starting difficulty? Is timing correct?

You need to address some or all the above before jumping to any conclusions. You need some reliable facts to make a sound decision of whether it needs a rebuild or just some maintenance.

Even when you know all, or most, it may only need new shells to improve the pressure, or there again, the crank journals could be oval and it needs a regrind. May only be top end causing poor starting. But rings may be worn out or previously severely overheated.

Simple way would be to throw money at it and completely refurbish the engine. But there again, most of it might be wasted.

Hope this gives you a few things to think about. These are not all the ideas you might be wanting. Someone else may have a few more that I have omitted.
RAB

 

[Ed Kratt]

I replaced the sending unit and the problem appears to have been corrected. Lots of good info on here, thanks to the people that replied to my post. Baled hay with it yesterday without any indication of a problem. Ed