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Isuzu 5.2 diesel timing

Updated: 10/20/2022
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8y ago

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there is alignment mark on crank pully for tdc and a mark on the cam shaft gear on the side closest to the lobes.....align this mark to the egde of the head closest to the the passengers side of the engine and keep the crank pully aligned on the first mark

(Powerstroke57 answer) Umm.... ya that's for the cam.... you have a pump too!!! I'll explain a little better. A 5.2L Isuzu 4HK engine was started in late 2004 to 2007. It was common rail fuel system which did away with the big bulky mechanical injection pump and went to a supply pump,common rail,and electronic injectors. Set the crank dampener to TDC and make sure #1 piston (front one) is on compression stroke. If the valve cover is off you will notice the cam gear has a white or yellow paint mark on one of the teeth of the gear. When your at dtc #1 the tooth will be parallel to the cast iron cyl head (not the aluminum rocker box the bottom one). which is on the right side of engine. Now for the pump. Remove all lines and brackets, etc. When the pump is loose pull pump forward slowly and you will notice a notch cut out of the aluminium housing of the pump and on the gear shaft (which is long about 6 inches) a very faint rectangle mark which should be aligned with the notch cut-out of the pump. You can't see the teeth meshing due to the gears being in back of engine behind the rear cover. So when u install the pump align the marks and slide the pump in slowly. At some point you will feel the gear on the pump start meshing with other gear teeth you can't see. Slide in slowly, and just before you can't see the marks anymore if the cut-out and rectangle marking on pump gear were aligned your good. If they aren't pull back out and turn gear one tooth accordingly and retest until they align at the last visible point. Then slide the pump in the rest of the way and bolt down. Just be thankful its a newer model because the later model (4HEI) are much more difficult to time and many more marks to deal with. Not to mention the pump weights about 50lbs. On the older 4HEI it's set dampener to 13 degrees and align the very faint marking on pump bell (not the thicker marking) to the mark on the rear cover, and you'd be viewing all this threw a small hole with a mirror, and manuvering a very cumbersome pump!! Alot of ways to mess-up, and you don't want timing to be close on these they need to be 100% correct or it will smoke alot, hard start, or not start at all!!! I hope this helps send me message if i can help more.

Powerstroke57

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Q: Isuzu 5.2 diesel timing
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