How do i position the timing marks when replacing my cam belt
Car: toyota corolla FX-G 1990 1.5L single overhead cam. timing belt mounted on side of engine so a big job to replace it as have to hoist engine to get cam belt round mount.
have found timing marks already but want to know what position they have to be in to get the timing right. both facing up? both facing down? any idea? cant get my hands on a workshop manual at this stage and i want to have it fixed on friday at the latest. any help would be apreciated
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Re: how do i position the timing marks when replacing my...
J__quin: 4-AC engine I believe we are both referring to.
Your cam gear can only fit one way and if you look at the cam gear, you will notice that there is a small hole in the gear close to the center, somewhat in between two of the large holes.
Position that small hole at the 12:00 PM and look through the hole.
You should be able to see a timing mark through the hole on the head. The mark should be dead center.
At the bottom, the crank woodruff key will be at 12:00 PM.
Also on the back side of the timing gear on the crank closest to the block, is a notch "V" which you line up with a dot on the block.
You should see the two line up with the key in the 12:00 PM position.
Put the belt on, when you set the tension, a good way to check it, is to find the longest span between the tensioner and the gear.
Take your fore finger and thumb and try to twist the belt. It shouldn't twist more than 45 degrees.
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This is a BIG job, requires removing drive belts, timing cover, timing belt and tensioner, probably the valve cover, in a very tight space. And obviously replacing all those items and timing the crankshaft/camshaft. There are some videos on YouTube that show the process - search in YouTube for "toyota corolla water pump replacement".
depending on trans and engine mount type the mark my be on flywheel but generally most cars it is located on the belt pulley attached to crank rod, center bottom one on engine block. the timeing mark should be visable from top looking down. if you use a big ratchet to turn over the engine by hand and go slowly, you should see thhe marks pass as you do so.
This is not s small job and should not be attempted unless you have a very good knowledge on timing systems and such? Luckily this is a overhead cam system, once you have removed all air system and hoses you can unscrew cylinder rocker cover to reveal cam. You will have to take cam cover off from side of engine, then you will have to locate cam timing tensioner, scratch cam timing wheel or mark with nail varnish for exact position! Then undo bolt to remove wheel, you will need a wedge to remove this/them if dual (this is the most important thing to get precise) then slacken tensioner to release belt after which you should be able to systematically undo cam shim bolts and release cam shaft, (make sure you make note of assembly for brackets as major part of healthy engine! If you shim
s look worn then Defo replace them . After replracing New cam shaft line up old wheel with the timing marks and then you will be ready to replace timing belt and lining up cam position then tighten up belt and replace cam cover and rocker cover, if when you try to turn engine over you hear tapping noise, turn off immediately and ask garage to set timing up for you but remember to inform them of your escapades for them to fix. If no tapping noise then it done and you deserve a big pat on the back. Good luck and hope this helps?
go to the library and get a book for your car with the motor you have in it.this should be a (sohc)single overhead cam motor and not the (dohc)dual overhead cam motor.the sohc motor the pump is located at the rad side of the motor and doesn`t need to have the timing cover removed.if it happens to be the dohc motor then your best to have a shop do the job as its not an easy job to do
this should be a (sohc)single overhead cam motor.this pump is located at the front of the motor towards the rad.thus you don`t remove the timing cover and easy to replace,once you remove the serpintine belt then the pulley on the pump then there are about 6 bolts that you remove to change the pump.if its the (dohc)motor i strongly suggest you have a shop do the job as its not an easy job to do and if you don`t get the timing belts timed exactly you will be sending the heads to the machine shop to repair.
If it is the single overhead cam engine,it's pretty straight forward-Crank-tensioner- cam.The tensioner is a simple slide-to-tension type.You will need to take off the top engine mount for access(i just supported the engine with a jack)If it's a twin cam?Sorry don't know as mine is single cam.(obviously all air con belts,altenator belt etc have to be removed first)
Hello, This job is alot harder on your car than most that's for sure. It really depends on your mechanical ability and time vs the amount your willing to pay someone else. This job is easy if your not afraid to loosen the passenger motor mount and slid the engine forward about an inch with a pry bar. (Which sounds alot harder than it is) But the Hanes manual lists alot of things to do to get around the motor mount.
Per Haynes Manual.
Place Coolant Expansion Tank to one side.
Lift out Power Steering Reservoir and put to one side.
Unscrew Wiring Loom bolt and move wiring to one side.
Remove Ground Cable from Strut Tower.
Bent the ground bracket down as much as possible.
Move Canister Purge Valve to one side.
Remove Plastic Cover from Alternator.
Unscrew and the alternator mounting bolt nearest the engine first.
Unscrew the other retaining bolt until it has fully disengaged from the
bracket (not possible to remove bolt from alternator at this stage).
Lift the alternator out, Pulley side facing upwards.
Take care not to damage or you might screw your surrounding components!
I would say if you dont work on cars or have mechanical ability you should prob take it to a profesional. I hope my answer helped more than it scared you....lol....Have a great weekend and please rate my answer if you felt it was helpful