How can a mechanic MISALIGN an Injector Pump when reinstalling it ??

 

It can be done pretty easily if you dont watch what your doing on the P7100 pumps. The B model P7100 pumps do not have a key way in the shaft as other pumps do. So, sometimes, if the tech does not get the shaft very clean and dry as well as the inside of the gear, the shaft can slip and turn inside the gear while torqueing the nut and cause advanced or retarded timing. A good rule of thumb after pump installation is to make sure your pump stayed at TDC by re-inserting the pump timing pin.

They can also get the timing off by not having the engine at true TDC.

 

the injector pump is "timed" to the engine on diesel the same way a distributor is timed to a gasser. sorry i hate to use that foul language "gasser" on this site.

anyway, if the timing marks are not ligned up, it's misaligned. Chances are, it's 180* out. 50/50 chance if he did not check for #1 tdc compression.

 

Misalignment of the P pump during installation is common. There is a little plunger timing lock on the side of the pump, and it is supposed to lock the pump for TDC on installation and removal. Unfortunately, almost all the older pumps have either that lock frozen or broken, or the guy removing it failed to align the engine timing marks, and locked the pump out of cycle for #1 tdc. Hence, reassambly becomes a "start as square one" process.

I is critical that the crankshaft, number 1 intake and exhaust valves, and the pump be manually set to TDC and handled carefully until the tapered drive shaft can be scribed during removal. Only about 1 in a 100 know to do the latter, but they generally learn after having been burned once.

 

Roger that.

How long of a process is it to reassemble/retime the Injector Pump ??

 

2hrs or so, it is not that bad.

 

Today's (Fri. Jan 13th) Update.

Still NO truck.......

Just stopped by the Dealership (before opening hours) and walked into the showroom. Who was standing there ??? The OWNER of the Dealership!!

I give him the SHORT version.

He quickly tracked down his General Manager who gave me this update.

He said the mechanic WAS able to get my truck retimed.... BUT while test driving it the timing SLIPPED !!

Well....they towed my truck to a REAL Diesel shop down in Dayton (20 miles away) to have them finish the job.

Apparently, there is a PLASTIC gear on the Injector Pump's shaft somewhere that was WORN out. He said that is what caused the timing to "SLIP".

Anyone heard of this happening before ??

Also, I was able to talk them into a LOANER car as well until I get my truck back!

The GM said it "SHOULD" be done on Monday...but NO LATER than next Tuesday. We'll see.....

 

The only thing I can think of is the plastic pin in the back of the pump has been screwed up or.... They probly dont know how to time it with out the pin? On mine I timmed it when I had the cover off for the KDP and so I was able to remove the gear compleatly and wipe the shaft with Tumbler degreaser prior to assembly and I had no PLASTIC GEARS? I would guess they broke the pin of and cant find TDC?

 

There is no plastic gear. Good thing the truck was towed away from that worthless mechanic.

 

They obviously want your business next time around, or they would not have made efforts to get it right.
Regardless of how they may have screwed things up they are taking steps to correct that- just a PIA for you to wait etc.

The dealership where I bought my previous truck basically told me to take a hike when I discovered a failed waterpump the same evening I took possesion of it. Needless to say I will never buy another anything from that store again. (Valley Dodge, Boulder Colorado)

Its going to make a great story some day...

Big Jimmy

 

What does this plastic pin do ??

Does it hold the pump in Time ??

The GM said a plastic gear was worn out on the Injector Pumps shaft. ????

 

The gear is metal and probably 6-8"s across. The plastic pin is for locating top dead center. It is located on the back of the timing cover. By pushing on the pin and rolling the motor over easily the pin will slide into a whole in the steel pump gear. When its in you are at TDC, except they are notorious for being off a few degrees. There is no plastic gear to go bad.
More than likely the plastic pin wouldnt push in, which is a common problem, and the mechanic doesnt know how to locate TDC any other way.

 

"I see!" said the Blind man..........to his deaf wife!