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By fast freddy - Last Month
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I have a 55 272 with a problem of #8 cylinder pumping out enough oil to run out the manifold to exhaust flange I have made a few changes and honestly dont know if either has affected the problem and dont recall which came first. I installed a 4 barrell set up with a t pot carb , at the same time removed the valley pan and built a baffle and hole to install a pcv Again I dont really remember this issue before but my memory is not the greatest . with the amount of oil involved I was sure there was a breach in the head gasket between # 8 and the oil return hole in the.. block , very close proximety . A very good friend and retired engine builder has suggested rings in that cylinder , it had best compression of all 8. but I didnt believe that much oil could be from rings on that one cylinder with good compression Well I pulled the head off and much to my dismay found no breach in head gasket . my friend came over for a look and confirmed no gasket damage , all oil seals were in place and valve guides were good . So he pointed back to rings. I just hate the job of pulling the pan , ive done it before and have to jack the engine up and various other things .. I guess what I'm asking is does anyone have any great ideas as to what else if anything could be going on or a similar situation thanks in advance Fred at 76 its a bit harder than 20 years ago LOL
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By Ted - Last Month
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Where are you pulling the vacuum for the PCV valve from? What’s the casting number of the intake manifold you are using?
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By KULTULZ - Last Month
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By fast freddy - Last Month
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Thanks Ted for your response.. casting # is ECZ-9425-A vacuum source is at the rear base of T pot carb there seems to be no oil in the intake runners from the pcv
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By fast freddy - Last Month
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thanks Kultulz interesting .. not sure how that would get oil into the intake didnt look like any leakage from bolt head to port .. thanks Fred
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By Ted - Last Month
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If the cylinder head was still on the engine, I would suggest performing a leak down test on that particular cylinder. From the amount of oil you describe, broken piston rings are a strong possibility. Something else to look for would be a hole in one of the pushrod holes within the cylinder head for the #8 cylinder which would be allowing oil to suck directly into the intake port and then into the combustion chamber.
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By KULTULZ - Last Month
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thanks Kultulz interesting .. not sure how that would get oil into the intake didnt look like any leakage from bolt head to port .. thanks Fred
Are you sure it is not an internal leakage but external?
What does #8 spark plug look like? |
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By fast freddy - Last Month
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plug is oily
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By Cliff - Last Month
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Valve guide seal
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By fast freddy - Last Month
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valve seal and guides are good thanks Fred
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By KULTULZ - Last Month
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"55 272 with a problem of #8 cylinder pumping out enough oil to run out the manifold to exhaust flange I have made a few changes and honestly dont know if either has affected the problem and dont recall which came first. I installed a 4 barrell set up with a t pot carb , at the same time removed the valley pan and built a baffle and hole to install a pcv ..."
You overhauled the engine and used a 55 or 56 4V INTAKE. There can be problems at #8 at the cyl head and intake mount.
At the coolant temp switch opening, there are two bolt holes as shown in the above illustration. If these are not used or blocked off, oil will run out of them hitting the valley pan and then running down the rear of the engine. Or could be sucked into a port with a poor seal.
Are you sure this is not what is happening?
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By KULTULZ - Last Month
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... hmmpf ... Still wondering about this. Like Ted asked, where is the PCV vacuum signal sourced (carb plenum or individual intake runner) and I assume you modified a road draft only valley pan for the conversion. Can you describe that modification? |
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By Ted - Last Month
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I have come across a couple of instances on the Ford Y where there was a hole or break-thru in the pushrod hole within the cylinder head which allowed a direct oil leak into the intake port of the cylinder head. Both instances had the engines pulling oil into just one cylinder and was bad enough eventually foul the spark plug. One of these was fixed by installing a bronze bushing into the pushrod hole thus sealing off the leak. The other was repaired by using a large caliber bullet casing which just happened to fit the existing hole perfectly. Have seen similar instances on the FE engines but those ‘break-thru’ holes were in the intake manifold rather than in the cylinder head. They were fixed in a similar fashion.
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By 55blacktie - Last Month
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Was the break-through hole caused by the push rod rubbing on the head?
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By miker - Last Month
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Given you’re in Texas, I’m afraid to ask how you installed that bullet.
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By 55blacktie - Last Month
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55blacktie (2/22/2026)
Was the break-through hole caused by the push rod rubbing on the head?
Maybe you should have asked what Ted did with the bullet.
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By Ted - Last Month
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55blacktie (2/22/2026)
Was the break-through hole caused by the push rod rubbing on the head?
The two instances where there were breaks in the pushrod holes in the Y heads were a result of porting that was performed to the intake ports. It would appear that the heads did not leak initially but were just thin enough that they cracked and/or broke thru either by heat cycling or distortion after a given period of time.
I did come across another Y cylinder head that was leaking coolant into a cylinder head intake port and was pooling a small amount coolant on top of the valve. That one was a result of heavy rust/pitting within the interior water jacket that created a pin hole sized leak which in turn would allow coolant to seep into the port of the head. It was fortunate that particular leak was caught early as it was pooling on top of a valve and not flowing into the cylinder where the cylinder could have potentially hydrauliced when attempting to start the engine which would have broken a piston and/or a cylinder wall.
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By 55blacktie - Last Month
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In the case of the coolant leak, were you able to repair the head?
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By fast freddy - Last Month
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Been away for a week guys vacuum source at base of carb not intake..Modified the valley pan with bafle and gromet hole for pcv.No oil running down back of engine but will have a look at that port Thanks Fred
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