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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Oliver 66 diesel timing

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kwf

01-08-2006 08:32:49

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Just rebuilt my 66 diesel yesterday and got it running. It is a little cold but it seems to be hard to start and misses at full throttle. runs good and has good power otherwise. new injectors were put in but nothing done to injector pump. Would advancing the timing help or hurt or make no difference. If I do advace the timing does that make it "inject" earlier or closer to TDC. My pre-heater element is not working so I know that will help in cold weather starting. And I am sure it needs to reach operating temp to help the miss, which I dont think it has yet.

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jjld

01-10-2006 05:01:50

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Re: Oliver 66 diesel timing in reply to kwf, 01-08-2006 08:32:49

kwf, not sure if your problem is resolved from your last post. Have an 88 that was similiar so will relate my experience. When I bought it, there was a cold start miss that soon went away with warm up. Tried breaking fuel lines and putting the thumb on the energy cell plug checking for heat but couldn't tell the cylinder at fault.

Wanted to get on with restoration without a complete overhaul but did take the head out for cleaning and valve touch up. They informed me of cracks in the head and the need for a new one.

Put the head on, the starting was worse and the miss never went away. Took the head to a head welding shop, they pressure checked it, declared none of the cracks mattered, but felt valve recession was the problem. New valves and guides and it now starts good and the miss is gone.

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kwf

01-10-2006 08:22:18

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Re: Oliver 66 diesel timing in reply to jjld, 01-10-2006 05:01:50

thanks, The head I put on was a fully rebuilt one with new valves, etc. It is running good now with no misses I think due to me advancing the timing, but it must still be preheated to start it. I guess half of the problem is fixed.

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J. Schwiebert

01-10-2006 08:43:35

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Re: Oliver 66 diesel timing in reply to kwf, 01-10-2006 08:22:18

Did they put seats in the head. Valve recession is a key.

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kwf

01-10-2006 08:49:10

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Re: Oliver 66 diesel timing in reply to J. Schwiebert, 01-10-2006 08:43:35

I do not know for sure, but everything looked liked new in the head.

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J. Schwiebert

01-08-2006 09:09:26

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Re: Oliver 66 diesel timing in reply to kwf, 01-08-2006 08:32:49

First of all lets be a little scintific on this. Does it miss on the same cylinder or does the miss move/ How did you time the pump and check it? Is this is a 66 or a Super 66. What model pump do you have, a PSB what? Do you have any white smoke. Did you use chrome rings, Have you given the rings aenough time to seat in? The pumps are timed to port closing. Advancing the pump timing will advance the start of injection. The govenor controls when injection ends. Your turn.

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kwf

01-08-2006 14:14:32

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Re: Oliver 66 diesel timing in reply to J. Schwiebert, 01-08-2006 09:09:26

It is a 66 diesel. The pump had not been removed. I checked it by putting FP on the flywheel pointer, making sure line on injection pump lined up wiht pinter and the tooth was about one off inside the pump side cover. I do not know if it is moving around. I can crack each line at the injector and engine starts to die down. I cannot get it to crank at all today. It has steel rings. there is white smoke while trying to crank over, very little white smoke while it was running. PUFFs while a full throttle. It is a PSB4A-70Z. I am sure the rings are not seated.

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J. Schwiebert

01-08-2006 17:28:37

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Re: Oliver 66 diesel timing in reply to kwf, 01-08-2006 14:14:32

Take the exhaust manifold off after you put your ear plugs in and see which port the smoke comes out of. Get a load on there and get those rings seated in. Also since you have a Z version of the pump how about a tractor serial number and an engie number? Do you know what is meant by the term"flow timing the pump" Also did you back the pump up say a 1/4 turn and then bring it back to double check the timing? What kind of fuel are you running?

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kwf

01-09-2006 04:29:13

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Re: Oliver 66 diesel timing in reply to J. Schwiebert, 01-08-2006 17:28:37

I do not know what flow timing the pump means. I did recheck the timing and advanced it about 4 degrees this cleared up the miss and it runs pretty good now. It is still hard to start unless I you use the preheater for about 15-20 seconds. Even after it is run and cut off about 30 minutes I must preheat about 15 secs and fires right up. It is a 1950 but I do not have the engine searial # at this time. I am using off road diesel fuel.

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J. Schwiebert

01-08-2006 17:26:47

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Re: Oliver 66 diesel timing in reply to kwf, 01-08-2006 14:14:32

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