Question about Isuzu Pickup
Hello bolinger05: My name is Roger and I will help you. Isuzu recommends replacing the timing belt every 60,000 miles. Should the belt have more miles then this on it it was due to be replaced. If the belt broke or jumped time? THere is a very good possibility that the valves were bent. This is a known interference engine. That means if the belt has a problem the pistons will hit the valves and bend them. One way to tell is remove a spark plug and do a compression test. If there is little to no compression then you have major problems. The compression on a new engine is 171 psi. But as the engine wears this changes. I would expect to see 125 to 155psi. Any thing less than 100 psi. and the cylinder wont fire. You can also have someone else help you. Remove the oil cap and look inside the whole. Have the other person crank the engine over. You should see the valves move up and down. Should they not move? The timing belt has a problem. This goes back to the interference motor. If the valves bent than you will need to remove the head for repairs.
The timing marks on the engine are easy to see. Locate the mark on the cam gear and align wit with the notch at the top of the motor plate. just in front of the valve cover. To align the crankshaft gear locate the notch on the gear. This is located at the key way. Then find the locate tab at 12 o'clock position just above the crankshaft. Align the marks and the motor will be in time.The oil pump does not time.
Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger
Posted on May 20, 2011
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Posted on Jan 02, 2017
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