1993 Ford f250

[lethal289]

7.3L diesel, 5 spd.

When parked on a slight grade, and left in gear, it seems gravity will take over and the truck will inch forward. Recently, it was parked almost level and moved a few feet in a couple of hours without a parking brake engaged. i know the easy answer is to use the parking brake, but the trans always held it in the past so whats the problems? Clutch, pressure plate, trans?

 

[guruatbol]

Well the transmission really doesn't hold any vehicle back. It is the fact it is in gear and the compression of the engine prevents the engine from turning which in turn will not let the trans turn.

You could have a slippery clutch allowing the trans to turn without the engine turning.

Check this by placing a chaulk mark on the pulleys and check to see if they move with the truck.

If they move it may be getting old and loosing compression. If they don't use the parking brake and get a new clutch.

Mel

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[AzPete]

Try shutting the key off when getting out......

Does it do it every time?

Have you tried different gears?

Sure some "friend" isn't messing with you?

I would say either bad clutch....and it would be real bad or clear out of adjustment or very poor compression.

 

[Midlife]

You have to leave it in first or reverse to get maximum use of the compression of the engine.

You are leaving it in gear, right???

 

[lethal289]

yes absolutely. Either first or reverse, depending on the way it was sitting, it does the same thing. The clutch was redone 15 thousand miles ago. Its a work truck and a brute with 300K hard miles. The drifting thing has only been happening the last couple of weeks. I've been chocking the wheels now every time i get out.

 

[Midlife]

Has engine performance changed over the years? Has your diesel mileage dropped?

My guess is that it is losing compression and needs an overhaul, or your clutch/pressure plate is bad. Do you have free play in the clutch pedal when at moderate rpm? If you goose the engine (ha ha!), does the rpm rise up before the truck accelerates?

Of course, the clutch itself would be cheaper than engine work, so I'd start there.

 

[AzPete]

Find the steepest hill, park on it, set the brakes and mark the pulley to look for pulley movement. Release the brake and wait for the truck to move some. Once it moves, set the brakes again and see if the engine has turned over. Engine turns....weak compression, engine does not turn.....weak clutch........not much else.

Of course, this was suggested by some grumpy old fart above also......

 

[lethal289]

Fuel mileage and performance haven't really been a noticeable difference. It has however been eating starters. Like one every 8 to ten months.

I'll try the hill thing and report back.

 

[FordDude]

Thread Hijack

Jake what is up with the Pie rats? Tied for first place. Or are they going to self destruct again after the all star break. :roul

fd

 

[BigHoss]

Fuel mileage and performance haven't really been a noticeable difference. It has however been eating starters. Like one every 8 to ten months.

I'll try the hill thing and report back.

I had a lifted f350 7.3l

If its eating starters it because your cranking to much either due to glow plugs or gp circuit fail. Use block heater in winter too it makes a difference.

I don't know about the trans prob. All I know is the auto trans like I had in mine e4od suck! Lol could be clutch not locking engine to trans or bad compression?