DibbyDibbyDJ wrote:This is a known problem with this engine. The fault is not a manufacturing defect, it is caused by incorrect tightening of the injectors after valve clearance adjustment.
DibbyDibbyDJ wrote:This is a known problem with this engine. The fault is not a manufacturing defect, it is caused by incorrect tightening of the injectors after valve clearance adjustment.
WUNSIE wrote:DibbyDibbyDJ wrote:This is a known problem with this engine. The fault is not a manufacturing defect, it is caused by incorrect tightening of the injectors after valve clearance adjustment.
More info on the incorrect tightening ? please DDDJ
Does it relate to under / over tightening ?
Proper procedures not adhered too, or failure to replace consumables with new
DibbyDibbyDJ wrote:WUNSIE wrote:DibbyDibbyDJ wrote:This is a known problem with this engine. The fault is not a manufacturing defect, it is caused by incorrect tightening of the injectors after valve clearance adjustment.
More info on the incorrect tightening ? please DDDJ
Does it relate to under / over tightening ?
Proper procedures not adhered too, or failure to replace consumables with new
Overtightening causes cracks, undertightening causes leaks and injectors to seize in head.
Injector washers (copper) must be replaced everytime they are removed, and the washers on the securing bolts must always be replaced.
Rusty Iron wrote:DibbyDibbyDJ wrote:This is a known problem with this engine. The fault is not a manufacturing defect, it is caused by incorrect tightening of the injectors after valve clearance adjustment.
Say what???!!! Have you got any 100% solid evidence of that?? Because this same mechanic has done the valve clearances twice. Mate, if you have anything at all that proves that, I'm begging you for it. This episode looks like costing me anywhere up to 3 1/2 or 4 grand.
Rusty Iron wrote:
Where did you get this info?
DibbyDibbyDJ wrote:Rusty Iron wrote:
Where did you get this info?
I am a Master technician at a mitsubishi dealer
DibbyDibbyDJ wrote:The procedure is very precise, and not as tight as people might imagine.
With all the injectors in place the bolts are fitted so the injector carriers are all level. This is to be done with a long straight edge. The bolts are then tightened to 1nm, then the each of the front bolts on each injector are tightened by 90 degrees, and the rear bolt of each injector is tightened 180 degrees.
I have replaced a head on 1 that sounds similar to yours, being overtightened, coolant staining all over the engine. cracks were seen around the water jacket in the head. Another where they were too loose, not needing a new head, but with 3 new injectors, injection harness, and a new camcover, as the gases leaked past the seals and caused the injectors to jam in the head. A slide hammer was needed to pull the injectors out.
DibbyDibbyDJ wrote:The procedure is very precise, and not as tight as people might imagine.
With all the injectors in place the bolts are fitted so the injector carriers are all level. This is to be done with a long straight edge. The bolts are then tightened to 1nm, then the each of the front bolts on each injector are tightened by 90 degrees, and the rear bolt of each injector is tightened 180 degrees.
I have replaced a head on 1 that sounds similar to yours, being overtightened, coolant staining all over the engine. cracks were seen around the water jacket in the head. Another where they were too loose, not needing a new head, but with 3 new injectors, injection harness, and a new camcover, as the gases leaked past the seals and caused the injectors to jam in the head. A slide hammer was needed to pull the injectors out.
DibbyDibbyDJ wrote:It takes time for the stress of overtightening to weaken the head.
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