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- Thunderbird Year
- 1978
Hi, I have a 78' Thunderbird that was having issue running smoothly on idle. At first I thought it was the spark plugs since they were old and crusty and flooded. Turns out the some cylinders have no compression due to bent push rods I assume. I have a few questions as I want to make sure I don't do anything wrong fixing the motor.
First I need to know what oil does the 78' use? It's the 400M engine. The manual only gives me a ford number which comes up as 10W40. A friend told be to put in straight 50, but that stuff is thicker than honey so that cant be right? Some valves are stuck and its dry and crusty under the valve cover so I need lubrication as soon as the engine turns. The previous owner probably never changed the oil.
Which brings me to my second question, what is the best way to unstick a valve again so that it moves and functions again. Can I use a hammer with force and hammer the springs under the rocker arms? I fear if I replace the push rods some might bent again due to the valves still being stuck.
The oil pump works but no oil is coming up, I believe it may have been due to a collapsed and clogged oil filter that I replaced. But I haven't tested anything more yet as I want to avoid turning the motor any more until I fix the rods.
And my 3rd question is, since I removed the valve cover I have no place to fill the oil back up. I see a couple of holes on top of the cylinder head where I might be able to pour the oil in. Can it go in any hole? I accidentally poured some oil into the push rod insertion hole because I thought that was an oil channel. Is that bad?
Thanks in advance
First I need to know what oil does the 78' use? It's the 400M engine. The manual only gives me a ford number which comes up as 10W40. A friend told be to put in straight 50, but that stuff is thicker than honey so that cant be right? Some valves are stuck and its dry and crusty under the valve cover so I need lubrication as soon as the engine turns. The previous owner probably never changed the oil.
Which brings me to my second question, what is the best way to unstick a valve again so that it moves and functions again. Can I use a hammer with force and hammer the springs under the rocker arms? I fear if I replace the push rods some might bent again due to the valves still being stuck.
The oil pump works but no oil is coming up, I believe it may have been due to a collapsed and clogged oil filter that I replaced. But I haven't tested anything more yet as I want to avoid turning the motor any more until I fix the rods.
And my 3rd question is, since I removed the valve cover I have no place to fill the oil back up. I see a couple of holes on top of the cylinder head where I might be able to pour the oil in. Can it go in any hole? I accidentally poured some oil into the push rod insertion hole because I thought that was an oil channel. Is that bad?
Thanks in advance
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