I'd love to know the answer to the subject before I take anything apart or off the engine unnecessarily...
Truck: 1971, 88", 2.25 petrol, IIA (24440729G / June 1970), with original engine #30700406A.
Seems there are two types of valve stem seals for 2.25 engines (please see attached pics):
1. O-ring that sits recessed down inside the valve guide tube wall (stem pushes up through it for the sealing factor). The O-rings are not visible when valve cover is off, since they're down inside the valve guide hole about 1/2". To replace them the head has to come off as I know it, and I won't be doing that job. In this case, I'd not take anything apart and just have my trusted shop do it.
2. An "Umbrella" type (as it's called) that simply slides over the already inserted and protruding valve stem and valve guide top. These rubber 'umbrellas' are visible with the valve cover removed, and based on numerous videos, they can be replaced with the head on, and just removing the valve cover. This I can do.
Question is... before I take anything apart (possibly unnecessarily if I have O-rings), how do I know which type of valve stem seals are on the engine? (ie: Is there a known change over date / engine number cut-off from one type of seal to the other?)
Thanks
Truck: 1971, 88", 2.25 petrol, IIA (24440729G / June 1970), with original engine #30700406A.
Seems there are two types of valve stem seals for 2.25 engines (please see attached pics):
1. O-ring that sits recessed down inside the valve guide tube wall (stem pushes up through it for the sealing factor). The O-rings are not visible when valve cover is off, since they're down inside the valve guide hole about 1/2". To replace them the head has to come off as I know it, and I won't be doing that job. In this case, I'd not take anything apart and just have my trusted shop do it.
2. An "Umbrella" type (as it's called) that simply slides over the already inserted and protruding valve stem and valve guide top. These rubber 'umbrellas' are visible with the valve cover removed, and based on numerous videos, they can be replaced with the head on, and just removing the valve cover. This I can do.
Question is... before I take anything apart (possibly unnecessarily if I have O-rings), how do I know which type of valve stem seals are on the engine? (ie: Is there a known change over date / engine number cut-off from one type of seal to the other?)
Thanks
Comment