4GJ2 new injectors= engine knock!!

[pro4x4]

Hi Guys I am new here and I have a real strange problem with my 96 bighorn 3.2 td. It has 150,000km's on the clock and have had it for just over 3 years- did the norm with oil charges and filters 10,000 -15.000 intervals. But bad luck still hit me with a cracked head, Hence starting was getting bad on first start up from sitting over night. Anyway took it to the garage and replaced the head and bolts etc-got it back and it was smoking like a dog at idle- once driving cleared until back at idle, we guessed that the injectors may need checking (ask them to check them when they were out -They just looked at them obviously!) So new injectors in..........hey no smoke at idle -told the old ones were stuffed (could they have picked anything up about the state of them by looking??) Now the main problem, just above idle now it knocks something wicked !- it's a horrible knock the garage now tells me it's the pistons been sloppy!!! Ah! They told me the block was fine, very little wear.
Now there was no hint what so ever of a knock before so is this possible?? I will have to go back to him on Monday but need to know more about the problem before I confront him, Please if anyone can offer some advise or reasons why this is possible would be greatly appreciated. My wife picked the truck up as I was at work I also have found one injector leaking quite badly.
Thanks Glen

[geeves]

bad injector timing can cause a big knock
It sound like you might of picked a bad garage A commpression test will show if the pistons are bad but surely they would of checked them with the head off.

[James W]

I think they are taking you for a ride....
Chaning the injectors will not suddenly make the pistons sloppy, nor should it change the timming.
I suspect these guys have mucked something up and want you to pay for the fix. One injector should not leak. They should be be better at the job than that. Did they fit overlength injectors for example and now they are hitting the pistons? Have agood look at the injectors if they come out again.

Also did they refit the correct head gasket? Do you still have the old one to check? The clearances to the injectors is that tight!

Get a compression test done, including a leak down test (the more usefull one). Don't just take their word for it.

Either way alarm bells should be ringing with how this is going....

[pro4x4]

Thank you guys! Good piont with injector length and yes a compression will be a damn good option for sure. I am about to ring the guy and see what he is going to do about the problem. Thanks very much as this gives me some area's to mention as to think I know what I'm on about and not some thicko!! This may wake him up so he can't pull the wool over my eye's. I'll let you how I get on.

Cheers Glen.