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Doug
Doug, ASE Certified Technician
Category: Car
Satisfied Customers: 6659
Experience:  16 years automotive and OTR repair including specialized training from Toyota and Mitsubishi
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Replaced timing belt on 3.

Resolved Question:

replaced timing belt on 3.8 mitsubishi endevor and now have lifter noise sounds like noise is coming from back cylinder head any suggestions we tried to bleed air by reving engine 3krpms for 15 seconds and let idle repeted this several times also noticed after oing this several times oil light flahed on and off we also replaced timing belt tensioner is anybody out their
Submitted: 4 years ago.
Category: Car
Expert:  Doug replied 4 years ago.

Hi,

First and foremost, you are certain the timing is 100% correct?

 

Did the cam shafts turn and have to be reset during the process? Often times the back cam springs out of position often more than once needing to be put back into position. If this happened, even if it is set correct now, this is still relevant.

 

Was the hydraulic tensioner replaced or the mechanical tensioner, or both?

 

Thanks

Customer: replied 4 years ago.

Hi

I am the service mgr i beleive he replaced th mechanical its the tensioner you have to use the vise on the noise is very loud from back head frt head sounds a lot quieter

Expert:  Doug replied 4 years ago.

Okay thanks.

Being the service manager, I'm going to lay out everything at once for you so you can relay it more efficiently to the tech working on it.

 

There is a hydraulic tensioner that requires you to put it into a vice and put a "grenade pin".

There is also a mechanical tensioner that is a bearing/idler with two pin holes in it that work as an eccentric to further adjust the tension. This is the bearing that the hydraulic tensioner pushes on.

 

If the hydraulic (vice one) was the only one removed, we're good on that note.

If the mechanical tensioner (bearing with two pin holes) was replaced or removed for ANY reason, it needs to be set properly. If it is not set properly, you can get loud clacking type noises that sound from the rear, and it WILL toss the belt if it is in the relaxed position... This will lunch the engine.

 

So obviously find out if this tensioner was removed or not. If it was, you will need the special tool to adjust the tensioner while tightening the set bolt. Any Mitsubishi or Chrysler/Dodge dealer will have this tool.

 

If all is well on that note, make absolutely certain the timing is correct. The rear cam is a bugger to see and to keep set while installing the belt. If it is off two teeth it will make noise as it will lightly tap on revolution.

 

If all is well there, we can get on with the common problem and solution. I stated the previously clarifications not just because it doesn't hurt to check again, but also because the next procedure could cause damage to the engine if either condition mentioned was present.

 

As I stated before, it is very common for the back cam to slip during install, or require working back and forth to get the necessary play to slip the belt on. On this vehicle the automatic lash adjusters are notorious for drawing air during this process, even only rotating the cam 20 degrees back and forth 2 or 3 times. To resolve this you will need to do an air bleed on the system. This is very close to what you were attempting, just a bit more drawn out.

 

With all previous safety concerns regarding the belt timing and tension taken care, Start the vehicle and bring it warm or at least 3 minutes of idle time.

 

Then slowly rev the engine off idle up to 3000 rpm over the course of 15 seconds.

After the 15 seconds, release the gas pedal and let it idle for 15 seconds.

Then, again slowly bring the engine speed up to 3000 rpm over the course of 15 seconds

Release the pedal and let it idle for 15 seconds.

Continue this process until the noise is eliminated. It can take up to 30 cycles before it is completely gone, particularly if the vehicle sat overnight, etc, as well. Once it has been reduced satisfactorily, drive the vehicle and any remaining noise should disappear immediately.

This is something I need to do on probably 1 out of 3 Endeavors that I do timing belts on, and it is always the rear cam that kills you because of the tension on it when at TDC1.

 

Just be sure, and I can not emphasize this enough, that the timing is correct and that the mechanical tensioner was either NOT removed/disturbed or if it was that the tension was set CORRECTLY during final installation.

 

If you have any further questions, or need elaboration, please let me know. I am extremely familiar with this vehicle a I am the only Mitsubishi technician in a 75 mile radius of my area. I would be happy to assist you further if needed.

 

 

 

 

 

Doug, ASE Certified Technician
Category: Car
Satisfied Customers: 6659
Experience: 16 years automotive and OTR repair including specialized training from Toyota and Mitsubishi
Doug and 11 other Car Specialists are ready to help you
Customer: replied 4 years ago.
we only replaced one tensioner
Expert:  Doug replied 4 years ago.

Great, I have seen people remove the mechanical tensioner too out of habit. If this is the case, it will need to be adjusted again.

If only the hydraulic tensioner was taken off and the rest untouched, you would be ok.

 

If that is the case, and timing is set right, proceed with the air bleed procedure I posted above.

Customer: replied 4 years ago.
WE DID THAT PROCEDURE APPROX 30 TIMES WITH NO CHANGE IN NOISE I GUESS WE NEED TO DOUBLE CHECK THE TIMIING ALSO THE ENGINE RUNS VERY SMOOTH,IF NEEDED CAN WE REMOVE THE REAR VALVE COVER AND ADJUST THE SPRINGS THANKS FOR INPUTI
Expert:  Doug replied 4 years ago.

Definitely by all means make sure the timing is set right and tension is correct. If the belt timing was off it would not be very smooth however... my only concern otherwise is that mechanical tensioner if it was disturbed.

 

There is no adjustment inside the valve cover; the automatic lash adjusters are all there is, as they are the contact point between the valves and the rockers.

 

Be slow and steady with the procedure and it will work if the timing/tension are right. I know it seems like forever, and you tend to make the 15 seconds shorter each time you count, but it will take care of it if there is air in there.

Sometimes if I am in a hurry, halfway through I will take it for a drive and cycle my acceleration to match the bleed procedure; it makes the time go quicker.

 

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16 years automotive and OTR repair including specialized training from Toyota and Mitsubishi