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continental 120 engine rebuild no oil to head

T

TO 20

New User
My father and I rebuilt my great grandfathers Harry Ferguson, the rebuild went good. Until we put around 30 hours on it we started to here a squeek coming from the valves. Upon further investigation we are not getting oil to the head it was dry we poured oil over the rocker arms the squeek went away immediately. We put a new oil pressure gauge in with the rebuild we are making 40psi at idle when it is cold and it drops down to 0 when we shut it off. We also thought it might be a head gasket problem maybe the holes did not line up. So we removed the rocker arm shaft and blew compressed air down the galley and it sounds like it is blowing into the pan. With the rocker shaft off and the galley wide open we cranked the tractor we made 30psi and still no oil to the head. We really need some help we are both stumped and really want to avoid splitting the tractor again.
 
I'm basing this on a 134 engine, but think it would be the same...

Strange that you can blow into the galley and hear air come out down below.

The oil to the rockers comes up from the rear main. Typically the oil will stop because the bearing was improperly installed or it has spun. But that doesn't explain air going...somewhere.

Again, I'm going by 134 design, so check this out before going in, but if it's the same, drop the pan and take a look at the rear main. The upper half of the bearing has a hole that lines up with the galley going up to the head.
 
That is what we thought we where hoping that the air would not pass through the galley indicating a spun bearing or improper head gasket alignment. The 120 also gets the oil through the rear main. When we rebuilt it we had the engine boiled we where hoping there might be a plug used for machineing that may have been left out, but we looked at a parts block we have and did not see anything.
 
Got to thinking, the oil flow up to the rockers is not a full flow, it's metered. Only a little gets sent up each tiime the crank galley hole lines up with the bearing hole. So cranking would take a long time to get oil up there.

Could you temporary the rocker assy back on and leave the rear bolt loose enough to let the stand slightly up off the head? Start it up, see if oil comes up. Possibly the oil hole in the rocker shaft is clogged. Are the corks in the ends of the rocker shaft?
 
Do you have the means to hook an external oil pump up to a
galley plug so you could cycle the oil through the system
without the engine running? Also if Im not mistaken it gets its
oil to the rockers through an oil passage in a rocker shaft
support pillar then feeds down the middle of the rocker arm
shaft. That being said is it possible there is an obstruction in
that anywhere? Also a main bearing has to have a clearance for
oil so even if it was installed upside down you would probably
get air into the crankcase.
 
Oil to the head comes up from the rear main an through the rear cam shaft bearing. Did you clean the oil passage during the rebuild? line up the oil holes in the rear main bearing shell?
 
The to20 rear main is not like the z134 where both
shells have an oil hole, Only one does on the to20
so you will need to pull the pan and pop the cap on
rear and check the bottom shell. If it has a hole
then they are reversed.
 
We did clean the passage from the rear main to the head. We also know that during assembly the rear main bearing was installed with the hole in the correct orientation. The corks are also in the rocker arm shaft I am going to try and work on checking this stuff out this weekend. I will keep you all posted, thanks for all of your help.
 
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