2.2 toyota diesel engine -should i be worried
Submitted: Sunday, Apr 20, 2008 at 14:05
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Member - kevin Y (SA)
Had a ford crossflow once before that had worn valve seals that blew smoke when starting each morning and then came good (smoke stopped )
The diesel blows white smoke when starting after standing for a week or more then is okay for rest of day.
Am new to diesel engines so haven't a clue , egine is in very good nick ,noisy little bugger but not as bad as a Mazda i have heard
Reply By: Thermoguard Instruments - Sunday, Apr 20, 2008 at 14:16
Sunday, Apr 20, 2008 at 14:16
Hi Kev,
White smoke from a cold diesel is unburned diesel vapour. You probably have one or more dead glow-plugs. Or maybe you're cranking before the plugs have had time to heat-up. There should be a glow-plug lamp on the dash. Usually it lights when you turn the ingition to ON and goes off a few (up to 10?) seconds later, when the plugs have had time to get hot. They should then stay on for some time after starting to ensure good combustion.
Contrary to popular mis-conception, glow plugs are NOT there to ignite the diesel fuel in a cold engine. They are to heat the combustion air to a temperature sufficient to ignite the air AND combust it fully. When stone cold, the metal of the psiton and head robs so much heat from the compressed air that's it sometimes incapable of igniting the diesel fuel at all, or at best, only burning a bit of it and sending the rest out the exhaust as white vapour.
Please have a look at my article "Why diesels are different" in the Topics - Technical section of this website for more info.
Ian
AnswerID:
299428
Follow Up By: Thermoguard Instruments - Sunday, Apr 20, 2008 at 14:18
Sunday, Apr 20, 2008 at 14:18
"ignite the air" above should read "ignite the fuel"!!
Oh, for an 'edit' function...
Ian
FollowupID:
565598
Follow Up By: Member - joc45 (WA) - Sunday, Apr 20, 2008 at 22:54
Sunday, Apr 20, 2008 at 22:54
I thought the glow plugs speeded up the release of phlogiston from the diesel fuel when cold.
;-)
FollowupID:
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Follow Up By: Thermoguard Instruments - Monday, Apr 21, 2008 at 07:13
Monday, Apr 21, 2008 at 07:13
Hi Joc,
"phlogiston"???
Ian
FollowupID:
565755
Follow Up By: Member - kevin Y (SA) - Monday, Apr 21, 2008 at 10:32
Monday, Apr 21, 2008 at 10:32
thanks for that will have gloplugs checked out -----i hold ignition on until light goes out then crank ---as i said it only happens when left standing for a few days which made me think of valve seals
FollowupID:
565781
Follow Up By: Member - joc45 (WA) - Tuesday, Apr 22, 2008 at 02:06
Tuesday, Apr 22, 2008 at 02:06
Hi Ian,
First there was Earth, Air, Water and Fire,
then Phlogiston theory explained all combustion processes:
Phlogiston
Gerry
FollowupID:
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Follow Up By: Thermoguard Instruments - Tuesday, Apr 22, 2008 at 07:46
Tuesday, Apr 22, 2008 at 07:46
Hi Gerry,
Well, I'll be... You learn something new every day.
Maybe I can start claiming EGT gauges drastically improve "dephlogistication" of diesel fuel and will improve you power by "up to" 15% and your economy by "up to " 23%?? IF little bits of pressed metal can, why can't I...
Ian
FollowupID:
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Follow Up By: Member - joc45 (WA) - Tuesday, Apr 22, 2008 at 10:19
Tuesday, Apr 22, 2008 at 10:19
Ian, I'm always here to try to enlighten our readers on the far reaches of science!
Hey, I just think you've found a new niche market!!
If people will believe the cr@p explaining lots of other gizmos on how to catalyse their fuel or de-polarise it, then using your claim, you're on a certain winner here!
Go for it!
Gerry
FollowupID:
565941