460 Big Block Ford from 1970. Noise from the left bank made me pull the valve cover and have a look. I bent a push rod, and I was able to retrieve it ok, even after it fell into the valley. I replaced it with a new one and it immediately broke after restart. So, I guess the lifter isn't lifting at all. Short of pulling off the top of the engine (intake manifold and all and replacing the lifters), does anyone have any recommendations for getting this unstuck from above...WD40? Transmission fluid poured down pushrod shaft? Beat on it???
2007-09-18 01:48:20 · 5 answers · asked by Paul 1 in Cars & Transportation ➔ Maintenance & Repairs
The proper way is, remove, clean, inspect, fix or replace. There are no potions and lotions that will fix it.
2007-09-18 02:30:46 · answer #1 · answered by spammer 6 · 0⤊ 0⤋
The lifter probably isn't the trouble.
You have a vavle stuck, or bent not allowing full travel.
Turn the engine by hand until the other valve on the suspect cylinder is fully open This will place the piston at the bottom of it's stroke. Then using a suitable pry bar, try and depress the valve that is breaking the pushrods. See if it fully depresses. Then remove both rockers and verify the stem heights are the same on both valves. If one is sticking, or bent, the head has to come off.
It is possible to replace a single lifter on the 460 without pulling the intake. They will come out through the oil drains in the head. There is a tool made for that, and it's not very expensive. You can also remove the clip on top of the lifter (once removed from the engine) and disassemble and clean it. A new one will be less than ten bucks though, so I'd replace it anyway. Also be sure to measure pushrod lengths, old with new to be sure you are getting the proper length.
2007-09-18 02:27:19 · answer #2 · answered by br549 7 · 4⤊ 0⤋
Even if the lifter was stuck extended, it wouldn't bend the pushrod. The valve stem is probably stuck in the guide. You need to depress the valve manually to find out. While the cylinder is down, preferably. You're probably in for a valve job.
2007-09-18 03:28:40 · answer #3 · answered by Nomadd 7 · 1⤊ 0⤋
A stuck lifter will most likely be stuck away from the camshaft, meaning the valve is open. If this occurred, the piston might have hit the valve and bent the push-rod. Most likely, the valve itself stuck shut and the push-rod bent when the lifter tried to open it.
2007-09-18 03:08:48 · answer #4 · answered by Lab 7 · 1⤊ 0⤋
I'd try spraying some CRC penetrating lubricant and then adding synthetic oil to the crankcase.
http://www.crcindustries.com/files/Freeze-Off%20Brochure.pdf
2007-09-18 02:00:08 · answer #5 · answered by bobweb 7 · 0⤊ 1⤋