Oops I have a problem. Timing belt.

[Jokertand]

I done a waterpump that was timing belt driven and accidentally had the cam pulley move when I took the pump off and now it wont start. I know that I need to find the cam position and reset it with the crank but what are the specific steps I need to take to fix the problem?????

 

[red85]

Which engine are you working on? I see you have a 2.8 but it has a chain.

 

[Will]

First, if the pulley slipped only a little, no problem. If it slipped a lot it's going to be more tedious. Assuming it's a notch or few out, turn the motor until the crank pulley shows TDC and the cam pulley is close to it's mark--remember the cams go around once and the crank twice, you may need another full revolution to get the cam marks close. Then you can look at the notches in the cam pullleys. They generally are pretty clear if you look carefully. Careful not to bump the crank mark, loosen the belt, move the cam pulley until the notches line up, put the belt back on. It's not hard at all.

If you can't easily see the marks on both the engine and pulleys you should get a manual. On some motors the pulley mark lines up with the oil pan seam or something instead of another mark.

If the cams are in a random place, you need to pop the valve cover so you can see the rockers for the #1 cylinder. Then you would carefully rotate the cam pulley (being careful of piston-valve interference) until both rockers are up--meaning the valve stems are as high as they will go. Look at the cam mark while doing that--it will line up when they are all the way up. Then set the crank mark and then put the belt back on.

To check the marks before buttoning it back up. turn the motor a full two revolutions and check it as the marks come up on the second crank revolution. That will pull the slack out of the belt and give you a true reading on the mark alignment.

A manual of some type should be consulted. Especially to make sure the tensioner is set correctly and that the mark alignment is correct.

 

[snake]

What he said-

You can also do this without removing the entire bottom cover or anything other than the top cover for that matter. If you remember how everything looked when you took it apart last time, and there are rubber plugs in the lower cover for tensioner access, you can loosen the tensioner through those plugs- then rotate the engine so that there is tension on the tensioner side of the belt which shoves the tensioner over. With tension on the belt, tighten the tensioner bolt and back the engine off a bit which will loosen the belt and hold the tensioner in place. Remove the belt off of the cam gear, rotate the cam back to its alignment marks (ensuring the crank it at TDC) and slip the belt back on. Then loosen the tensioner, and rotate the engine so the tension is on the opposite side from the tensioner- so the tensioner with take up all the slack- then tighten the tensioner and put the cover back on. In no circumstances should you attempt to start the engine with the tensioner loose...

 

[85_Ranger4x4]

Which engine are you working on? I see you have a 2.8 but it has a chain.

2.8's don't have a chain, they have timing gears. 2.9's were the first in that engine family to have a chain.

 

[gotmudd]

2.8's don't have a chain, they have timing gears. 2.9's were the first in that engine family to have a chain.

dude, all motors have timing gears. it's just a matter of whether or not those gears are chain driven or belt driven

 

[Jorley]

dude, all motors have timing gears. it's just a matter of whether or not those gears are chain driven or belt driven

The 2.8 is neither chain nor belt driven. The crank gear and the cam gear mesh together.

 

[85_Ranger4x4]

dude, all motors have timing gears. it's just a matter of whether or not those gears are chain driven or belt driven

 

[Will]

He's obviously working on something else.

 

[Turbo-T]

Hey Mud. Chains and timing belts run on sprockets, Gears mesh together.

 

[Will]

Maybe cogs is more appropriate for belts.

 

[gotmudd]

Hey Mud. Chains and timing belts run on sprockets, Gears mesh together.

maybe i'm a little too redneck here, but i just got done doing the timing chain on my 390c.i.d and the parts people refered to it as a chain and GEAR set with no mention of sprockets, although i gotta agree with you they do look like sprockets they are refered to as gears.