No oil in cylinder head, no oil pressure.

[highzmen]

Hi guys, I picked up a 67 mustang with a 200 a couple months ago and the only problem I'm having with the motor is the oil pressure and flow into the head. I've pulled the distributor and turned the oil pump and it's pumping fine with good volume in the block, but it is not going up into the cylinder head. Where should I start?

Thanks,
Highz

 

[Explorer]

With my very limited knowledge being new to these engines, I would start by checking the rocker shafts.

 

[69.5Mav]

it is not going up into the cylinder head

I would pull the rocker arm shaft and spin the oil pump and watch to see if it comes out of the rear, I believe, rocker arm pedistal mount on the head. If yes then clean up the rocker arms and shaft and try again. If no then your blockage is deeper in the block and more in depth trouble shooting will be needed. There is a sticky on rocker arm shaft oiling and cleaning.

viewtopic.php?t=29111

 

[CZLN6]

Howdy Highz:

You likely have a sludge plug somewhere in the oil line to the top of the head. First off, what is the condition of this engine? Has it been apart? Has it had the head off recently? IF so it is possible to put the head gasket on backwards and plug the oil transfer slot in the head.

The oil to the head is pumped up along the #11 head bolt. It is the rear bolt on the distributor side of the engine. From the bolt hole oil flows through a transfer slot in the head and head gasket then up through the rear rocker arm staunchon to the rocker arm shaft. It then passes through a hole in the shaft to each rocker arm. Each rocker arm has two hole, one on each side, to distribute oil- one to the spring side and the other to lube the pushrod. Oil flows from the rear of the shaft to the front.

While this is a good solid, stable system, it is very easy to get plugged at several spots along the way. Any old engine deserves a good cleaning of the rocker shaft and rocker arms. But, If oil is not getting up through the head you will have to look deeper.

Here's a couple of things to try- remove the rocker arms by removing the 4 rocker stand bolts. Then spin the oil pump while watching the rear bolt hole. Oil should begin to ooze out of this hole. If it does, you will likely find a plugged up rocker shaft. If it doesn't you will likely find a blockage between the head and the block- either the gasket is on backwards, or the oil transfer slot is plugged.

Let us know what you find. I hope this points you in the right direction.

Adios, David

 

[JackFish]

Here's the sticky:
viewtopic.php?t=29111

 

[highzmen]

thanks for everyone's reply, i will take look at it this weekend. as far as i can tell, the engine has not been assembled. i bought it from a friend who had it sitting for about 2 years.

 

[highzmen]

took a look at the engine today. pulled off the valve cover and removed the #11 bolt. Ran the oil pump and surely, but slowly oil came up out of the #11 bolt hole.

The oil has been sitting for a couple of years, should I change it out? If so what weight of oil should I use? Also, whats the best way to flush out the oil?

Thanks again,
Highz

 

[rocklord]

The oil has been sitting for a couple of years, should I change it out? If so what weight of oil should I use? Also, whats the best way to flush out the oil?

I'm hoping you changed the oil before trying to start it! If not, YES, change it out. :nono:

If your getting oil up the bolt hole, you need to next disassemble and clean up the rocker shaft and the rockers. There are two oil holes in the rocker arms that need to be cleaned out, a small drill bit between your fingers is a good way to do it. Once you have everything clean, reassemble and reinstall the rockers, then run the oil pump to see if oil comes out of the rocker arms now. If oil comes out of the rockers, you should be good to go.

If you decide to use an oil flush, don't drive the car with it in your oil; most oil flushes are used with the car stationary. Follow the recommendations on the bottle for length of time and how fast to run the engine. Then drain the oil, remove the oil filter, and replace with fresh oil and filter. I wouldn't use anything less than 10W30; avoid straight weight oil (30 or 40). Some people on the forum use 20W50, but that may be too heavy for the season.

Good Luck.

 

[69.5Mav]

should I change it out? If so what weight of oil should I use?

Most definately. I would use a good quality 10W-30. Change it at 500 miles then at 1000 miles thereafter every 2000 miles unless it starts coming out clean in that case you can try streching out the intervals.

You can also have your oil analyzed. This will tell you if you can strech out the oil changing intervals.

You should follow the dirrection in the afor mentioned sticky on cleanig you rocker arm shaft.

 

[highzmen]

will do as suggested. how many bolts are there on the rocker arm shaft to remove?

 

[CZLN6]

Howdy Back Highz:

There are 4 bolts holding the rocker arm assembly to the top of the head. The rear stauncheon transfers oil from the head to the rocker shaft. The shaft transfers oil to each rocker arm, back to front. Loosen all four stauncheon bolts then gently pry them loose. When lifting the rocker arm assembly be careful to seperate the pushrods. They will stick sometimes. Inspect the push rod ball ends. They should be round and shiny. IF they are not they have been suffering from lack of oil and will need to be replaced. The wear almost always show up on the pushrod balls and not in the rocker arm cups, but check both.

Once you get it all back together you might want to run a high detergent oil or additive to prevent sludge accumulation again.

Adios, David