| Author | Message | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 446 Registered: 9-2006 Posted From: 173.166.209.2  Rating: |
As promised here is the video of me replacing one of the injectors on my 671. http://www.youtube.com/watch?v=MSk3bTCxZ0U . | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 7 Registered: 10-2009 Posted From: 98.119.179.203 Rating: N/A |
Hi Zimtok, Interesting video. I didn't realize injector replacement was as straightforward as that. I too have a '60 '04. I fear one of my injector's tips may have blown off. I sometimes get alot of white smoke at start-up. If I rev 'er up a little, it clears out right away though. Curious as to why you replaced yours? Did you do all or just the one? Watched your "parking in Oxford" video with some amusement. I remember the narrow streets well, having lived there for 10 years in my youth, from '69 - '79. I'll never forget brawling outside of a bar with some drunken classmates from Oxford High. There was two of them and one of me. I was swingin' like mad and inadvertantly punched an Oxford Cop (who'd snuck up behind us) right in the kisser. Ha! He wasn't too appreciative of that one, needless to say. Still have some good friends back there, though I've never been back. Cheers, Kevin | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 447 Registered: 9-2006 Posted From: 173.166.209.1 Rating: N/A |
Kevin, I replaced all 6 injectors. About 3 years ago we had fuel getting into the oil and found that the injector seals were leaking. I pulled each injector and replaced the seals (see my other injector video) The old seals were badly dry rotted and cracked. That seal replacement got us through the last 3 years. Recently I had noticed a significant loss of power, then I regained my power back. I put it off to bad fuel supply at first and changed the filters and a lot of the old fuel lines. Then the reduced power symptom returned. After looking at a few things I found I was getting air/foaming in the return fuel line and tracked it down to something with the injectors. Someone on the board mentioned it may be an injector that is sticking allowing the compressed cylinder air to push back into the injector and then into the fuel return line. Knowing that the injectors were old enough that the seals went bad 3 years ago I decided it best to just replace them all. It now seems to have more power then it ever did. . | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 448 Registered: 9-2006 Posted From: 173.166.209.1 Rating: N/A |
We haven't been back to Oxford for about 2 years. We did have a semi-regular gig there but since the club we played at has changed management we haven't been asked back. | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 8 Registered: 10-2009 Posted From: 98.119.179.203 Rating: N/A |
Hmmm, mine has run consistently well since I took ownership about 11 years ago. It just started to blow white smoke (especially when the weather is cold) when first started. Once the air pressure gets up enough to activate the air throttle (15-20 seconds) I bump her up to about 750 rpm and she'll clear right up. If it's really cold, like under 40 degrees, I will typically use a shot of ether and fire her up from under the hood with the remote starter switch. I can manually open the throttle and bump the revs up to clear her out. | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 9 Registered: 10-2009 Posted From: 98.119.179.203 Rating: N/A |
Hmmm, Mine has run consistently well since I took ownership about 11 years ago. It just recently started to blow white smoke (especially when the weather is cold) when first started. Once the air pressure gets up enough to activate the air throttle (about 15-20 seconds) I bump her up to about 750 rpm and she'll clear right up. If it's really cold, like under 40 degrees, I will typically use a shot of ether and fire her up from under the hood with the remote starter switch. I can then manually open the throttle and bump up the revs to clear her out. I just replaced a faulty block heater and, when used in cold weather, I don't get any white smoke on cold starts. The fact that I do get them when the engine is stone cold (along with an obvious one-cylinder miss) that clears-up with a bit of throttle make me think a bad injector. Thoughts? Kevin | ||
| John & Barb Tesser (Bigrigger)
Registered Member Username: Bigrigger Post Number: 464 Registered: 9-2007 Posted From: 96.42.5.35  Rating: N/A |
Thanks Austin. Whether entertainment or information, I think you have a real touch for videography. John | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 10 Registered: 10-2009 Posted From: 98.119.179.203 Rating: N/A |
The heavy breathing is a somewhat hilarious touch... Seriously, well done. It helps to de-mystify an otherwise "one-of-those-things-better-left-to-another" sort of operations on our old coaches. | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1339 Registered: 5-2001 Posted From: 65.74.72.213 Rating: N/A |
Kevin, smoke and a one cylinder miss go together as low compression on one cylinder. If there was enough compression to ignite the fuel in that cylinder, there would be very little smoke. You might do an inspection through the airbox openings. Sometimes, the loss of compression has obvious causes. In some engines, loss of clearance in the valves due being cold will cause a misfire until some warmth reaches the misfiring cylinder. I haven't heard of that as a cause in DDs, though. Most likely, this is an aluminum block symptom. Good luck. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 11 Registered: 10-2009 Posted From: 98.119.179.203 Rating: N/A |
Thanks Tom, Good advice. I have never peeked into the airbox openings. This engine runs like a champ during summer months (So Cal) and, when the recently replaced block heater is used during cold temps, start-ups are clean. Someone mentioned that perhaps an injector had "blown a tip" and that's what I had on my mind. Ever heard of this? | ||
| Donnie Daugherty (Dr_detroit)
Registered Member Username: Dr_detroit Post Number: 13 Registered: 3-2008 Posted From: 98.145.222.114  Rating: N/A |
If your Injector had blown a tip, it would have caused a runaway, (been there-done that). It is not unusual for detroits to white smoke or miss after starting when cold if they have a lot of wear on them. I would reset all valve clearances and run the rack. | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 449 Registered: 9-2006 Posted From: 173.166.209.2 Rating: N/A |
Kevin, I thought about muting the sound just because of my big sigh there in the middle, but I don't like videos without sound even if it is just background sound. This was my last injector to replace and I was trying to keep it short and keep myself out of the view of the camera. | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 12 Registered: 10-2009 Posted From: 159.83.252.233 Rating: N/A |
Donnie, Thanks for the advice. I hope to be able to do just that eventually. Zimtok, Just funnin' ya! It's a good job you did on your video, and much appreciated for sharing it! | ||
| Jim Wilke (Jim Bob) (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 570 Registered: 2-2001 Posted From: 184.0.3.170  Rating: N/A |
Kevin, I agree with Donnie. Detroits smoke white when cold starting and if it's cold enough won't do ANYTING but smoke white. (Unburned fuel) When it's freezing, and my bock heater was broken, I would have to crank for 20 seconds, and rest for 15 seconds and repeat about 4 times till the cylinder temps got hot enough from compression to ignite the fuel. Then she'd smoke white for about 4 minutes. (3,400 ft in NC) In summer at 80 degrees, instant start and a little grey smoke for about 1 1/2 minutes. | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 13 Registered: 10-2009 Posted From: 159.83.252.233 Rating: N/A |
Hi Jim, I replaced my block heater recently and I no longer get the white smoke on start-up in cold weather. Still, it didn't smoke white much at all, even in cold weather w/o block heater, until suddenly it did. It wasn't something that gradually began to increase. I just noticed one cold day when I fired her up a great cloud of smoke. The smoke is sometimes accompanied by a miss. My exhaust is split-manifold with two pipes. Ones smokes, the other doesn't. When I asked around last year, I was told that it might be a sticking injector on one cylinder. Since the (natural) engine is equipped with N70s, I thought that perhaps I'd swap 'em out for some 60's or 65's. I do get alot of black smoke if I am not careful accelerating... except a sea-level where she runs pretty clean and strong. I am at about 2,600 ft and get a bit of smoke under most circumstances. I just keep one eyed glued to the rear-view and throttle accordingly. Anyone have thoughts on best injector size for my engine? It does make good power with the N70's... Thanks, Kevin | ||
| Kevin Baxter (Bus_boy)
Registered Member Username: Bus_boy Post Number: 14 Registered: 10-2009 Posted From: 159.83.252.233 Rating: N/A |
Forgot to mention, Before I replaced the block heater and started the engine in cold weather, it smoked white with the miss. When I would rev the engine slightly, say to about 700 - 800 rpms, the miss and smoke would clear out immediately. If I let it idle, the engine might miss and smoke indefinately, or at least until it warmed-up. I never gave it that chance, preferring to clear 'er out with a little rpm. I feel pretty sure that the miss and smoke are coming from just one cylinder. I hope my engine is not badly worn. Runs like a champ and, again, the white smoke thing just sort of happened overnight. This is why I had convinced myself that I have an injector problem. Thoughts? Thanks |
