Question for you diesel tech???
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Senior User
Joined: Jul 2010
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Question for you diesel tech???
Well went to dealer they wanted to show me that the eot and the ect were within spec.. As I went into the garage I noticed that one of the techs was sitting in the truck reving it up and holding it at 3K RPM By the time I went around to the other side of the building and got to the truck the tech was still on it approx 3-4 minutes.. I told him to stop and asked what he was doing He said warming the truck up to take the temp readings.. he went on to say that it is fine to rev it as it has a rev limiter and would not harm the motor...
Someone please correct me if I'm wrong I always thought that you never free rev a gasoline motor past 2000-2500.. Was this guy a hack or what.. Can you free rev a diesel up to 3K for a few minutes without any harm???
Thoughts and opinions... Not sure I ever want to bring the truck back to them...
Someone please correct me if I'm wrong I always thought that you never free rev a gasoline motor past 2000-2500.. Was this guy a hack or what.. Can you free rev a diesel up to 3K for a few minutes without any harm???
Thoughts and opinions... Not sure I ever want to bring the truck back to them...
Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
There is a couple of tests that require you to run at 3k rpms (check for aerated oil, biased icp sensor). Egr test requires the motor to be over 185* EOT. Easiest way is to raise rpms until temp is reached.
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So the general consensus is the tech wasn't bull****ing me when he said reving and holding the engine at 3K rpms to warm the engine wouldnt harm anything...
Could he have damaged anything by reving it like that???
Could he have damaged anything by reving it like that???
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Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
no on both counts. you are good to go.
I always say if the customers only new half the stuff we have to do to there rides.......
this is one of the many reasons we dont like customers in the shop
I always say if the customers only new half the stuff we have to do to there rides.......
this is one of the many reasons we dont like customers in the shop
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Thanks Cheezit... wonder if you could give me some advice... Tech says my EOT and ECT are within limit most he got was a 12 degree difference.. He even showed me on his computer(My mac computer showed a much bigger variance).. Thats why he was reving it... He went on to say that if it continues to puke it might be a head gasket... But he can't do anything untill its for certain... Is there a test that can show a failed headgasket.... He sayed he drove it over 20 miles and it wouldn't puke... And I just drove it 300 miles to the canadian border and no puke.. Not sure if its the cool weather 70*F or the new clutch fan.. Wondering if all this time it was a faulty fan???
Thoughts and opinions.. Thank you
Thoughts and opinions.. Thank you
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
the only way to test for head gaskets is to moniter the cooling system pressure. that takes some setting up of a gauge and tieing in to the system.
yes it is possible to have puking from a failed fan cluth.
yes it is possible to have puking from a failed fan cluth.
Posting Guru
Joined: Oct 2006
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Well went to dealer they wanted to show me that the eot and the ect were within spec.. As I went into the garage I noticed that one of the techs was sitting in the truck reving it up and holding it at 3K RPM By the time I went around to the other side of the building and got to the truck the tech was still on it approx 3-4 minutes.. I told him to stop and asked what he was doing He said warming the truck up to take the temp readings.. he went on to say that it is fine to rev it as it has a rev limiter and would not harm the motor...
Someone please correct me if I'm wrong I always thought that you never free rev a gasoline motor past 2000-2500.. Was this guy a hack or what.. Can you free rev a diesel up to 3K for a few minutes without any harm???
Thoughts and opinions... Not sure I ever want to bring the truck back to them...
Someone please correct me if I'm wrong I always thought that you never free rev a gasoline motor past 2000-2500.. Was this guy a hack or what.. Can you free rev a diesel up to 3K for a few minutes without any harm???
Thoughts and opinions... Not sure I ever want to bring the truck back to them...
Senior User
Joined: Apr 2005
Posts: 357
Likes: 0
From: Anchorage, Alaska
Any engine is designed to withstand high idle with no load for at least a short period of time. A diesel will run all day long at high idle no load because they have a low high idle rpm. A factory gasoline engine will also usually withstand a high idle no load situation. Most newer vehicles won't let you rev to high idle in neutral anymore, and some won't let you power brake against the auto trans either. If an engine is modified to achieve more rpm and power than originally designed, then that is when a high idle no load situation can cause a problem. Usually if a problem at high idle ocurrs, you will know it! And if a factory engine blows from it, it was probably broken to begin with.
If you drive any meduim and heavy trucks, you will find that you drive them with the foot to the floor. You use the power and let the engine do what it does best.
If you drive any meduim and heavy trucks, you will find that you drive them with the foot to the floor. You use the power and let the engine do what it does best.
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
It's under load but I routinely hit 3500 to 3800 in tow haul coming downs grades in the Sierras. Doesn't hurt the engine one bit, still uses no oil and the brakes look almost new going on 40,000 miles. Will be at 3,000 climbing the grades in 3rd to let the gearing do the work. The engine actually runs cooler like that rather than lugging the grades in hi gear at 2,000.