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Injection Pump timing problem

bison said:
There is more ways to skin that cat without removing the timing cover..
Pull the # 1 injector,use a rod or wire in the hole and run the piston up to TDC,see if the IP gear marks line up at 6 and 12 ,if not,turn the crank another revolution.
Click to expand...

Tried that but pre cup in the way of piston and could not get rod through. Will have to pull things apart. With other reference it does appear to be out at least a tooth.
 
I guess i was wrong on the crankshaft gear dot in relation to the keyway(excuse......been over 2 years since i had one apart):eek:
The injector hole was just an idea,works on direct inj though.:agreed:
 
And the verdict is
















Out one tooth. This has been out for 10 years when the PO hard the IP take a dump when he was on holidays down south. The pump was done at a GM dealer. Looking back through all his service slips from local GMC dealer, he has fought cold weather starts for years. Then one hot August day he sold it to me! Always had hard cold starts and I tried but never thought of this as it ran so good when warm.

ak you are right on the HB does line up with lower bolt hole at TDC. And has my picture upside down again, never used to do this!
 

Attachments

  • ip marks.jpg
    ip marks.jpg
    89.5 KB · Views: 10
It doesn't say much for the GM mechanic that did that.

Glad you found that.
 
So if there are let say for round numbers there is 60 teeth on that gear divided by 360 Deg that would put that IP out of time 6 Deg. 12 Deg of crank timing, does that sound correct?
 
NVW said:
It doesn't say much for the GM mechanic that did that.

Glad you found that.
Click to expand...

X2.. You know I preformed an experiment there a while back. I was trying to see how easily one could BOTCH an IP swap...

IF you kept the timing cover ON, the IP gear WILL NOT jump a tooth, the housing fits 'snug' enough around the gear, NOR can you possibly bolt the IP to the IP gear wrong. The three bolts simply will not go in as they are spaced randomly.

Good news on the easy fix.
 
3500GMC said:
X2.. You know I preformed an experiment there a while back. I was trying to see how easily one could BOTCH an IP swap...

IF you kept the timing cover ON, the IP gear WILL NOT jump a tooth, the housing fits 'snug' enough around the gear, NOR can you possibly bolt the IP to the IP gear wrong. The three bolts simply will not go in as they are spaced randomly.

Good news on the easy fix.
Click to expand...

wonder why the dealer would have had the timing cover off?
 
Man I can't say, but it is impossible to F up an IP swap cover ON. I'd even venture to say, you could pull the IP, attempt to start the engine, then discover the IP is 'missing', bolt it back in, and be good.
 
I wonder if it's possible that this problem came from farther back up the timeline. Could this mechanic have done the swap without removing the timing cover, then maybe struggled to get timing set correctly but got it "close enough". They are usually paid per job done and the more jobs done within a certain time frame the more money they take home.

Just speculating, considering human nature.

Don
 
Years back they may have removed the timing cover to do the job, I was careful when I did the IP swap without removing cover but was still worried that the gear could have jumped a tooth. Good to know it can't. Thanks for all the help and support guys.
 
3500GMC said:
X2.. You know I preformed an experiment there a while back. I was trying to see how easily one could BOTCH an IP swap...

IF you kept the timing cover ON, the IP gear WILL NOT jump a tooth, the housing fits 'snug' enough around the gear, NOR can you possibly bolt the IP to the IP gear wrong. The three bolts simply will not go in as they are spaced randomly.

Good news on the easy fix.
Click to expand...

Drop a worm gear clamp into the intake port and "botch" an IP swap. I did that. Makes dropping a bolt into the gear drive look like a cake job... Dropping a bolt is the only reason the timing cover would have to come off.

IMO the problem was from the factory. Check the service slips before the IP was swapped - perhaps it had a cold start issue to lead to an IP swap?
 
WarWagon said:
Drop a worm gear clamp into the intake port and "botch" an IP swap. I did that. Makes dropping a bolt into the gear drive look like a cake job... Dropping a bolt is the only reason the timing cover would have to come off.

IMO the problem was from the factory. Check the service slips before the IP was swapped - perhaps it had a cold start issue to lead to an IP swap?
Click to expand...

No service slips from before the Pump took a Dump, but PO told me it happened while vacationing and stranded. A previous search of Serial # showed it being done a a dealer but I no longer have that info. It was covered under the 11 year warrantee for IP.

Yes dropping bolts does waste a TON of time in life!!!!!
 
How painfully easy to time when the Frickin IP gear is timed correctly!!! :eek:

Set new installed IP vertical after correcting gear timing

Started good and ran up to 190 Deg

Commanded Time set engine did not stall WAHOO Desired 2.8 - 3.2 Actual dropped to 0

Shut off turned IP a RCH to driver's side

Rechecked 3.5 - 3.8

Commanded TDC Learn first number to show was -1.85 Stopped there

Tightened down other IP nuts done!

5 Minute process

Snapshot attached
 

Attachments

  • After IP gear timing.pdf
    986.5 KB · Views: 28
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