4jg2 cracked head

[wairarapa]

so ive bought a truck with a cracked head unfortunately but ohwell just got to deal with it. have taked the old head off and am planning on getting a second hand head and all the gaskets and stuff down from the isuzu specialist parts in auckland next week, I have had a quote for a new head and gaskets for about $1000 with the valves in it the second had one should be closer too $700 hopefully. is getting the second hand one about as cheap as it gets? also wondering as ive taken allot of stuff apart to get the head out is there any bits i could give a good clean up or whatever to improve reliability and performance in the long run? and does anyone have any tips for putting it back together? it looks to me like ive bent one or two of the push rods in the process of getting the head out is this a big deal? THANKS!

[geeves]

Bent push rods should be replaced.

[wairarapa]

yea thanks thought that was the case, as we were pulling the head out at the last minute i pulled four skinny hoses off from around just above the fuse box there and in all the exitement forgot to mark which ones go back were i dont have a clue what they are for? but the skinny hoses came off with the head after i quickly pulled them out, how can i go about finding how they go back? can't find it in manual maybe looking at another bighorn could help

[geeves]

One goes to the vacuum pump on the alternator 2 go the the EGR valves on the inlet Dont know the other one. Easy answer is block the one to the vacuum pump and ignor the rest. I dont have these any more

[wairarapa]

I read something somewere about locking the timing gear whats the deal there?

[geeves]

Shouldnt matter for a head job as the cam is in the block. If you take the timing cover off you will see 3 pulleys. Each has a 10mm hole in it that can line up to a threaded hole in the block. You put a bolt in each hole then replace and re tension the timing belt then remove bolts. If the cam is one tooth out the pistons kiss valves then do something very naughty to them

[dasnoboarder]

If the cam is one tooth out the pistons kiss valves then do something very naughty to them

[Blondini]

Sounds like my xwife

[wairarapa]

haha don't wan't those pistons being naughty! you say it doesnt realy matter for a head job so I might just forget about the timing gear then?

[geeves]

For now but the timing belt should be changed every 100000km. If you dont know when it was done its wise to have a look at it

[dan32]

Hi , I plan to buy one with the head gasket blown, ....and try to fix it .... ;o)
Would you like please to share more from your experience doing this job ?
I will may change my mind , or I may convince my self to do it. In this stage I am a little bit worried ..to do it or not .
Cheers

[geeves]

90% chance the heads cracked

[dan32]

Thanks for you fast replay ;o)

I can see on trademe a rebuild engine.

http://www.trademe.co.nz/Trade-Me-Motor ... 498228.htm

How clever would be to buy one and replace the faulty one ? the effort would be worth ?

[356221]

For Wairarapa, Bought a reco 4jg2 off isuzu specialists in auck for wife's truck, motor good, good to deal with , they supply no extra gaskets, cost $3800 delivered to deep south. internals all reco'd, pump, injectors only checked. Ron

[dan32]

Okay , so I do not buy the car, but I start fix it for my friend ;o) and I will like to post the picture of this …I hope to be successful operation .
If will work we will have a set of pictures with the steps ;o)

[dan32]

I will try to fix it, I am not sure if I can ….so the forum can be very helpful.

Before we start

[dan32]

Ready to start.

[dan32]

Next three steps

[dan32]

The end of the first day.

[dan32]

Second day we get on this stage, and now ….we will have to deal with the second part ;o)
To put all back ..and starting the car again ;o)