How often should my wife drive my jeep? - Page 2 - JeepForum.com
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post #16 of 27 Old 12-30-2009, 09:01 AM
Deezelweazel
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An engine is designed to work under load.
Idle allows lateral movement of the crank, con rods and pistons.
This movement combined with the cold engine temperature is the worst thing you could do to an engine.
Wear is accelerrated.
Acids and humditiy developed during idle have to be absorbed by the oil.
It takes a long time to reach operating temperature- Don't get fooled by the water temps- oil is still cold.
But it develops its lubricity best at operational-temp.
A lot of fuel has to be injected during idle to overcome friction. Not all of this fuel gets burned.
It dilutes the oil. Oil looses the viscosity because gas has no lubing abilities.
This dilluted oil is pressed through the bearings. Bearings are sensitive to non circular movements caused by the lateral movements with no load. And the cycle closes its ring. Accelerated wear of the bearings (bearings are very sensitive to all movements without that lubing oil pressure film between the bearing and the crank), more play in the bearings, lack of oil pressure- a worn out engine.

Of course this not to recognize during idle-it's a slow and unrecognized process over months and years.
Just avoid extended idle times.
It's different for turbo engines. They need idle to lube the turbo bearing to avoid wear. But it is a process timed in seconds until oil pressure is up. Not for minutes and long times!


Last edited by Deezelweazel; 12-30-2009 at 09:25 AM.
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post #17 of 27 Old 12-30-2009, 09:40 AM
Dabbill
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My wife cant drive a stick. So my step dad drives my jeep once or twice a week to work to keep stuff lubed up. Will be nice once I can get home from Afghanistan to drive my jeep again.
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post #18 of 27 Old 12-30-2009, 09:46 AM
rshives
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lol I was going the complete other way until I realized the reasoning behind you wanting her to drive it.

Thanks for your service.
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post #19 of 27 Old 12-30-2009, 10:46 AM
Turner
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I would have her drive it once a week, and have her engage 4wd once a month. Use 4 hi, for a bit, and then 4 lo. Lubes everything in the front axle, and tcase.

The ethanol in gas can and will eat holes in your fuel lines. Being a new TJ you won't have as much problem, but my old YJ I would drive only to wheel, and using crap gas from shell that uses ethanol ate my lines. I would only use chevron, or whatever stations use 100% gas while you are away.

Thank you for your service!

--Turner--
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post #20 of 27 Old 12-30-2009, 10:51 AM Thread Starter
Blackhorse6
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Thanks Everyone!

This Forum never fails to disappoint, thanks for the advice, I was thinking that 1/week was the way to go. Wanted to re-enforce that she needed to get it moving not just idling.
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post #21 of 27 Old 12-30-2009, 11:06 AM
Kinless
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If anything like my wife. Every time its left unattended she will take off in it.
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post #22 of 27 Old 12-30-2009, 11:09 AM
silvershark
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i let my old ford idle once a month for 10 + years and drove it may be 5 times... fords are pretty tough though.
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post #23 of 27 Old 12-30-2009, 11:24 AM
kuebelwagen
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Thanks for Our freedom, be safe!

In love with, Suki.

Pain is weakness leaving the body.

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post #24 of 27 Old 12-30-2009, 02:55 PM
BlueFlame
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Quote:
Originally Posted by Netpackrat View Post
The engine may not come up to full temperature simply idling, which is necessary to burn off the condensation that builds up in the engine while it is sitting, and also the oil pump isn't flowing as much volume at idle, so extended idling isn't necessarily a good idea in any event. Also, even if the engine reaches full temp and the oil flow to the interals is adequate, leaving the vehicle sitting idling does nothing for the lubrication of the other drivetrain components.
Quote:
Originally Posted by Deezelweazel View Post
An engine is designed to work under load.
Idle allows lateral movement of the crank, con rods and pistons.
This movement combined with the cold engine temperature is the worst thing you could do to an engine.
Wear is accelerrated.
Acids and humditiy developed during idle have to be absorbed by the oil.
It takes a long time to reach operating temperature- Don't get fooled by the water temps- oil is still cold.
But it develops its lubricity best at operational-temp.
A lot of fuel has to be injected during idle to overcome friction. Not all of this fuel gets burned.
It dilutes the oil. Oil looses the viscosity because gas has no lubing abilities.
This dilluted oil is pressed through the bearings. Bearings are sensitive to non circular movements caused by the lateral movements with no load. And the cycle closes its ring. Accelerated wear of the bearings (bearings are very sensitive to all movements without that lubing oil pressure film between the bearing and the crank), more play in the bearings, lack of oil pressure- a worn out engine.

Of course this not to recognize during idle-it's a slow and unrecognized process over months and years.
Just avoid extended idle times.
Great replies!
One more thing - most of the above will contribute to drastically reduced life of the catalytic converters.


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post #25 of 27 Old 12-30-2009, 03:24 PM
Mud-Hunter
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I bought a manual for this very reason and I WRECKED the damn thing last weekend. Oh Why me!?

I would just have her start it up until warmed up and once around the block and RIGHT back to bed.
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post #26 of 27 Old 12-30-2009, 04:35 PM
Scotch740
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Quote:
Originally Posted by Turner View Post
I would have her drive it once a week, and have her engage 4wd once a month. Use 4 hi, for a bit, and then 4 lo. Lubes everything in the front axle, and tcase.
.,..
You know the whole drive train is spinning whether your in 4wd or not, right?
No need to put it in 4wd to lube things unless your have locking hubs, and in taht case you just lock them to get things lubed.
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post #27 of 27 Old 12-30-2009, 04:41 PM
GreenZZ
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Quote:
Originally Posted by Netpackrat View Post
The engine may not come up to full temperature simply idling, which is necessary to burn off the condensation that builds up in the engine while it is sitting, and also the oil pump isn't flowing as much volume at idle, so extended idling isn't necessarily a good idea in any event. Also, even if the engine reaches full temp and the oil flow to the interals is adequate, leaving the vehicle sitting idling does nothing for the lubrication of the other drivetrain components.
Thank you for your explanation. I was wondering myself
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