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#61
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Despite one of you resorting to personal attacks, still no one has found a credible piece of technical information to support their claim that resistance measurement is a suitable way of determining if a GP is good or bad. There may be a few on here who use resistance as an indicator, that does not mean that it is a definitive method.
I have seen GP's that have around 1.8 ohms resistance & do not glow at all. Eventually the bolt/threaded portion gets very hot. I am sure there are those who have cars they treat like a baby . For those of us who use these cars as daily drives & need them to be ultra reliable despite being used in harsh conditions, GP's need to be good & experience has shown that GP removal & testing is the best method to determine if they are good. Any time in the past million miles that I have experienced rough starting I remove & test properly my GP's. I have tried this resistance idea with less than perfect results. The resistance method is about as good as using GP's as thermocouples to time your injectors ~ a hair brain idea that comes up now & again. I am amazed that a professional engineer working in the jet engine industry would support the use of a test method that is not approved by the equipment manufacture.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#63
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I've used the resistance method effectively for a number of years. If I have hard starts or rough cold idle I ohm out the plugs. Every time I've replaced the plug with resistance outside the norm it's solved the problem. It's a quick effective diagnostic method. If the problem isn't solved then further testing may be necessary.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#64
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I am amazed that a degreed engineer who claims to understand these engines and the thermodynamics that allow them to start refuses to read the ample evidence right on this thread that the resistance method is more than adequate for 90% of the members who participate on this forum.
He is also unable to provide a single piece of evidence that a glow plug with less then perfect tip temperature is unable to satisfactorily start the engine. Therefore, any of his advice should be summarily ignored. |
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#66
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#67
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Something funky like that was going on. Didn't do it before and hasn't done it since the plug was replaced.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#68
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Like wise I would not take advice from some one who believes that you can use a change in GP thermo couple voltage to time injectors any more than I would take advice from some one who still believed the world was flat.
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#69
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Best you stop making false statements about others to advance your position. Quote:
This thread contains many opinions. I have repeatedly requested that some one provide some sort of proper information from an equipment manufacturer or similar that supports your claim. I note you have now suggested that it is only an adequate method for 90%. What do you do if all GP's "resistance test" ok & the problem is still there ~ look for some thing else? After all if we follow your logic the GP's are fine. A previous post has shown a GP that would not work but it still "resistance tested" ok. No one is as blind as he who does not want to see !!! If this resistance method you so strongly promote was so good I am sure some enterprising individual would have produced a tester. A simple resistance meter with replace / ok / replace sections on the scale. It could be sold along with a thermo couple style injector timer & a couple of cans of snake oil.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving Last edited by layback40; 12-04-2011 at 10:31 PM. |
#70
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He cannot even read this thread and comprehend what it contains. He expects a glow plug manufacturer to confirm or deny anecdotal evidence. I'm done with him. |
#71
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__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#72
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#73
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Quote:
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#74
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I haven't tried it but it would be a worthwhile experiment. I'm not going to do it now since the temperature this morning was 2 below zero F.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#75
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Kerry ,its seems Ive had the same symptoms as yours.My 300cd would give a few cranks a then disengage the starter.Temp outside was 45f or under,I doubled up the glow plug runs with no go.I replaced the last glow plug on the back cylinder and havent had the problem since.This old car has well north of 400k and I was expecting some start up issues soon with the colder weather,with no block heater it makes it necesary for all 5 GPs to pull full glow.In testing a few GPs Ive pulled from junkyards I simple have 2 wires with gator clips with me ,the thicker the wire the better. The plug ends always get cherry red hot ,I never let them go for more than 3 secs though ,just need one time to learn what mixing them up can do to your hand to sand quickness.
Last edited by chasinthesun; 12-05-2011 at 04:17 PM. |
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