When to replace timing belt on GM engine?
The first step in replacing an OHC timing belt that is still intact is usually to rotate the crank until the timing marks indicate top dead center. On most engines, you want the number one piston at TDC on its compression stroke (not exhaust stroke) to get proper timing alignment.
What kind of timing belt does a GM overhead cam use?
Some overhead cam engines in General Motors vehicles use timing belts to drive the cam (the 2.0L for example), some use chains (2.3L Quad Four, Cadillac’s Northstar dual overhead cam 4.6L V8, the Aurora Northstar 4.0L V8 and Chevy’s Vortec 4200 inline six), and some use a combination of both (Chevrolet’s 3.4L V6).
What kind of timing belt does a Mazda 3 have?
Here is a list of timing belts and timing chains for a Mazda 3. Reference the model year with the corresponding engine to see if your car has a belt or a chain. .
Do you need to change timing belt on Chevy Cruze?
As long as the belt hasn’t broken (which would require the head to be removed to fix the valves and maybe pistons) there is no need to use any special tools to time everything. The tools lock the crankshaft into the correct position as well as the two cams. The write up is in the works.
The first step in replacing an OHC timing belt that is still intact is usually to rotate the crank until the timing marks indicate top dead center. On most engines, you want the number one piston at TDC on its compression stroke (not exhaust stroke) to get proper timing alignment.
Some overhead cam engines in General Motors vehicles use timing belts to drive the cam (the 2.0L for example), some use chains (2.3L Quad Four, Cadillac’s Northstar dual overhead cam 4.6L V8, the Aurora Northstar 4.0L V8 and Chevy’s Vortec 4200 inline six), and some use a combination of both (Chevrolet’s 3.4L V6).
Why does the timing belt jump on an OHC engine?
On OHC engines where the water pump pulley tensions the timing belt, a failure of the water pump shaft bearing may cause enough loss of tension to allow the belt to jump time. So any time you’re replacing a failed water pump on such an engine, don’t assume cam timing is correct.
When to replace timing belt on 1998 Metro?
But most belt manufacturers recommend replacing the timing belts on these engines at 60,000-mile intervals (see chart on page 21). The only exception is GM’s recommendation to replace the timing belt at 100,000 miles on the 1998 1.0L 3-cylinder Chevy Metro. Determining the true condition of a timing belt isn’t easy for two reasons.
On OHC engines where the water pump pulley tensions the timing belt, a failure of the water pump shaft bearing may cause enough loss of tension to allow the belt to jump time. So any time you’re replacing a failed water pump on such an engine, don’t assume cam timing is correct.
Where is the ignition timing mark on a GM engine?
On most engines, you want the number one piston at TDC on its compression stroke (not exhaust stroke) to get proper timing alignment. If the engine has ignition timing marks on the crank pulley, it makes the job easier.