At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
The best place to look for this item is in the library. The reference section has the Chilton guides, find the one for your year make, model and engine. It should show pictures andgive complete instructions for any repair
There are several ways to time the cam to the crank. Be sure to check the manual before you install the timing chain or belt.
Some timing sprockets are properly timed when the marks face each other.
On others, there must be a certain number of chain links between the marks.
Sometimes chains have colored links that must be aligned with the marks on the sprockets.
Some overhead cams have a mark on the cam gear that lines up with a mark on the cylinder head when the timing mark on the damper is at the TDC mark.
Align the timing marks for the camshaft and crankshaft sprockets before removing the timing belt or chain.
If the old parts are available, carefully compare the new gears or sprockets with the old ones. Check the keyway and timing marks just in case there might have been an error made in manufacturing. Sprockets are sometimes stamped backward. Its much better to find the problem during assembly, rather than waiting until problems show up after reassembly and reinstallation.
Maintaining Valve Timing
During a valve job, it is essential to keep the timing chain or belt in place to maintain correct valve timing. Position the number one cylinder at TDC. Some overhead cam engines use a single long chain for a cam drive. The chain can be wedged against its guides with a tapered block of wood. the chain tensioner on some ohc engines must be wedged to keep the chain in position during cylinder head removal. courtesy of nissan motors.
Some engines have a lower and upper chain. These engines do not require special attention to wedging the chain. Be sure to look for hidden head bolts and check the repair manual before removing the OHC head.
There is only 1 "set" of timing marks. If there is more than 1 then someone has modified your engine components. Here is a picture of where they should be.
1.There is a Timing Pointer on the back of the engine. There is a White mark on the flywheel. The white mark must line up with the timing pointer, for Number 1 piston to be at Top Dead Center.
2.Facing the engine, looking at the camshaft sprocket. The sprocket has spokes. On one of those spokes is the word, "UP" in raised letters, or there is a small Dot. As you can see here, the spoke with the word UP goes -> Up. (Same thing of course if it is a Dot, instead of UP)
On the back of the camshaft gear, (Sprocket), are marks. On the edges of the camshaft gear. These line up with the top edge of the cylinder head. The surface of the cylinder head, where the valve cover bolts down to.
I'm sorry, at present I do not have a website, that I could link you to for a diagram, or photo.
×