Another 6.9 with timing problems
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Tuned
Joined: Sep 2010
Posts: 485
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From: Boise Idaho
Another 6.9 with timing problems
I'm working on my cousins 86' f250 6.9 idi 197k, all stock except for duel exhaust. Now what happens is that there is some smoke when he pulls his boat and it lacks power. Boat isn't very heavy. I pulled it no problem with my bronco ii 2.9 lt. It does the same thing when driving up to the lake on the grades without a load and blows a lot of black smoke. He's been driving it this way for two years since he bought the truck. Now I know there are a lot of different problems that can cause this but what immediately stood out to me was the injection pump which was retarded almost all the way to it's limit. So I thought hey, it's just out of time. But the more I advanced the pump the worse it got.
So. Is the pump gear off by a tooth? That's my only guess but I didn't know these engines would even start when off a tooth. The injection pump was rebuilt last year but according to him the truck ran the same before then. My timing meter broke after some use (still nee to get a ferret adapter) but I went through the entire spectrum and where it was is the best on power. So thought I'd get you guys to chime in until then I get to see the exact timing.
Sorry to ramble on
. Want to get as much info out there as I can. Thanks in advance.
So. Is the pump gear off by a tooth? That's my only guess but I didn't know these engines would even start when off a tooth. The injection pump was rebuilt last year but according to him the truck ran the same before then. My timing meter broke after some use (still nee to get a ferret adapter) but I went through the entire spectrum and where it was is the best on power. So thought I'd get you guys to chime in until then I get to see the exact timing.
Sorry to ramble on
. Want to get as much info out there as I can. Thanks in advance.
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
I'm working on my cousins 86' f250 6.9 idi 197k, all stock except for duel exhaust. Now what happens is that there is some smoke when he pulls his boat and it lacks power. Boat isn't very heavy. I pulled it no problem with my bronco ii 2.9 lt. It does the same thing when driving up to the lake on the grades without a load and blows a lot of black smoke. He's been driving it this way for two years since he bought the truck. Now I know there are a lot of different problems that can cause this but what immediately stood out to me was the injection pump which was retarded almost all the way to it's limit. So I thought hey, it's just out of time. But the more I advanced the pump the worse it got.
So. Is the pump gear off by a tooth? That's my only guess but I didn't know these engines would even start when off a tooth. The injection pump was rebuilt last year but according to him the truck ran the same before then. My timing meter broke after some use (still nee to get a ferret adapter) but I went through the entire spectrum and where it was is the best on power. So thought I'd get you guys to chime in until then I get to see the exact timing.
Sorry to ramble on. Want to get as much info out there as I can. Thanks in advance.
So. Is the pump gear off by a tooth? That's my only guess but I didn't know these engines would even start when off a tooth. The injection pump was rebuilt last year but according to him the truck ran the same before then. My timing meter broke after some use (still nee to get a ferret adapter) but I went through the entire spectrum and where it was is the best on power. So thought I'd get you guys to chime in until then I get to see the exact timing.
Sorry to ramble on
. Want to get as much info out there as I can. Thanks in advance.
Thread Starter
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Tuned
Joined: Sep 2010
Posts: 485
Likes: 0
From: Boise Idaho
How accurate is the timing mark? I have been told by others on this site that it can't be relied on. But can the proper timing position be on the retarded side of that line? Maybe someone has had some experience on this. As soon as I figure out this pump position problem I can look at the other possible issues but this one has me stumped.
Fleet Owner
Joined: Jul 2006
Posts: 20,385
Likes: 848
From: Mi'kma'ki
the meter will jump around when timing this way.you need to watch the needle and pay close attention to where it hangs out the most.record where it hangs out for a least 2 full seconds.or.......kinda hard to explain,you'll see a spot she keeps going back to after a while and hang there.it can be tricky.takes a trained eye.
your very retarded on the timing.
your way down (up numerically) on the ATDC #'s.
you want to advance it up (down numerically) closer to 5 ATDC (use 5 if you don't have a clue on what your fuel is.)
she'll get a LOT more rattle than your used to,so don't be scared lol.
she'll also go like a rapped ape compared to @ 18 or even 13 ATDC too.
she'll come alive for ya.
if you still see black smoke once she's advanced in the ballpark of correct.then turn the fuel down,or the air up.
no.it is VERY doubtful that correct engine timing would be on the drivers side of the ip mark.
you need to swing her over to the pass side of things a bit.
don't get carried away,but at the same time remember; diesels rattle.
keep going with the lumy timing meter.your on the right track.now you just need patience to find 5 ATDC.
your very retarded on the timing.
your way down (up numerically) on the ATDC #'s.
you want to advance it up (down numerically) closer to 5 ATDC (use 5 if you don't have a clue on what your fuel is.)
she'll get a LOT more rattle than your used to,so don't be scared lol.
she'll also go like a rapped ape compared to @ 18 or even 13 ATDC too.
she'll come alive for ya.if you still see black smoke once she's advanced in the ballpark of correct.then turn the fuel down,or the air up.
no.it is VERY doubtful that correct engine timing would be on the drivers side of the ip mark.
you need to swing her over to the pass side of things a bit.
don't get carried away,but at the same time remember; diesels rattle.
keep going with the lumy timing meter.your on the right track.now you just need patience to find 5 ATDC.
Thread Starter
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Tuned
Joined: Sep 2010
Posts: 485
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From: Boise Idaho
Some good advice. My timing meter is a digital display. I will give it another go and watch it more closely. I got my other one timed but it could be I just wasn't patient enough with this one. If I can manage to get what I believe is a proper timing number than I will take it for a test drive with a trailer and see what happens. It could be someone turned up the fuel and it needs to come back down. Or I can put on twin turbos and blow the thing up, which is what my cousin wants me to do. He's kind of crazy that way. I'll try timing again tomorrow and let you know how it goes.
Cargo Master
Joined: Dec 2010
Posts: 2,123
Likes: 5
From: Fort Worth, TX
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Tuned
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