1977 460 easiest way to check if timing chain is broken?
Unfortunetaly, you'll need to remove the cover to do this. There is no other way to check it.
1. Remove the radiator fan and cover; alternator and belt; (it should not be necessary to remove the other belt, or harmonic balancer on this engine, however if it looks as such, then remove.
2. Once you have those off, remove the water pump (unless the water pump bolts go into the block itself, you may not need to remove the water pump; however, in the event you have purchased a "timing chain kit" the water pump gasket(s) may be included; if so, go ahead and remove and use the new gaskets.
3. Remove the timing chain cover. Before you take out the timing chain and gears, (even though the timing may be off, mark the chain and gears as they sit (this is for safe measure; in the event the timing was not miraculously affected)
4. Take the old chain and gears off. Pull the number one plug out, and using a screwdriver, insert into the plug socket - using a socket and ratchet on the harmonic balaner bolt - clock wise, rotate the engine until you feel the #1 piston (screwdriver come up all the to TDC. (top dead center) You will know if you went to far, as pressure will releave off the screwdriver.Pull the screwdriver out, and back the engine up ever so slightly (keep screwdriver in just enough so you'll feel the piston return to TDC. This has just set your timing to where is should be. Later, with a timing light, you can fine tune it.
5. Take the new Chain, and gears, and put them together as such:
A. Top gear will have a dot. With the gear in the chain, rotate the gear until the dot is on the bottom, pointing straight . The small gear, will have a dot, or a notch. Locate it, and do the same, except make this dot or notch face straight up toward the dot on the top gear. These two dots should face eachother straight up and down.
B. Carefully, bring the chain and gears level, and insert into place on the block. (make sure area is free and clean completely of any debris, dirt, or any dust that may have settled. Once in place, making sure the dots are straight up and down.
C. Make sure the old gasket is clean from the block and the timing chain cover. When using a straight blade to clean, careful not to gouge the cover or block as this can cause potential leaks.
D. Apply gasket sealer to the gasket and the cover. Place gasket onto cover (or you can do this on the block) - let set for about 10-20 minutes. If the truck acts like it wants to start, but has trouble, loosen the distributor cap (if installed) and rotate it in either direction, until truck starts. Once it starts, try to put the distrubutor as close to it's original posotion as possible, or to a posotion that the truck remains running. With a timing light, point it down at the harmonic balancer and look for two timeing marks. (they should be white - sometimes blue) - when these two lines are aligned, and remain aligned, readjust the distributor again if needed. You're truck should idle smoothly between 800-900 RPM's at idle.
I highly suggest purchasing a service manual for this process as well. This will have more detailed instructions for the process, as well as give you a certified reference to go by. I suggest getting a CHILTONS. They are very discriptive and, if needed, pictures are usually better and more detailed as well; as well as any iillustrations.
I hope this information is useful and helps you get your truck running. I used the process for whichI go my 87 Buick running (top gear on timing chain was completely stripped) I followed the directions (from the service manual) and my car ran again. (note: if your truck has a coil pack, then on the top gear, there may be a magnetic component bolted to it - It is imperative that you put this piece on the new top gear - or the truck will not start - trust me....)
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Apr 07, 2009 |
1998 Ford Escort