How long do 91 engines last
Thread Starter
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Senior User
Joined: Feb 2003
Posts: 171
Likes: 0
From: Utah
How long do 91 engines last
Hi,
I haven't posted to this particular forum before, perhaps someone can help me.
I am replacing the bearings on my pickup, and have a couple of questions. It is a 1991 351W 4X4, with 130K miles.
The book says you can get the oil pan in and out without removing the engine. I have not been able to. Has anyone else? And if so, how? (I got the pan off with a great deal of trouble, but can't see how to get it back on)
How long do these engines last with normal use? If I have to pull the engine to get the oil pan on, should I go ahead and pull the heads, or can I expect the valves and pistons to still be in good shape?
My pickup seems like it has always leaked oil somewhere (at least for the last 6-8 years). I have replaced the oil pan gasket, the valve cover gaskets (twice), the intake manifold gaskets, and the timing chain cover gasket at different times due to leaks. Have others had this same problem? How do I put it together without it leaking?
Thanks,
John.
I haven't posted to this particular forum before, perhaps someone can help me.
I am replacing the bearings on my pickup, and have a couple of questions. It is a 1991 351W 4X4, with 130K miles.
The book says you can get the oil pan in and out without removing the engine. I have not been able to. Has anyone else? And if so, how? (I got the pan off with a great deal of trouble, but can't see how to get it back on)
How long do these engines last with normal use? If I have to pull the engine to get the oil pan on, should I go ahead and pull the heads, or can I expect the valves and pistons to still be in good shape?
My pickup seems like it has always leaked oil somewhere (at least for the last 6-8 years). I have replaced the oil pan gasket, the valve cover gaskets (twice), the intake manifold gaskets, and the timing chain cover gasket at different times due to leaks. Have others had this same problem? How do I put it together without it leaking?
Thanks,
John.
How about this one -- what is the flow rate for the injectors in this vehicle? 19 #/hr?
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
How long do 91 engines last
As to how long an engine will last, that depends on how it's driven, how well it's maintained, and how well it's kept in tune. I replaced bearings in my old 390 last year - they were 32 years old and had 160,000+ on them. It's good to go now. On the other hand, my '78 460 is dying at 25 years and 140,000 miles.
As far as your injector flow rates, I can't help you there. My Holley flows 40 pounds an hour minimum :-)
As far as your injector flow rates, I can't help you there. My Holley flows 40 pounds an hour minimum :-)
Posting Guru
Joined: Dec 2001
Posts: 1,668
Likes: 3
From: Lincoln USA
How long do 91 engines last
AS far as the pan goes, disconnect the motor mounts then jack up the engine as far as possible. Now wedge some good strong wooden blocks between the engine and mounts. That should provide enough clearance. But since you already have the pan off you might have to lift the engine with a hoist. Hope this helps.
Thread Starter
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Senior User
Joined: Feb 2003
Posts: 171
Likes: 0
From: Utah
How long do 91 engines last
Well, I have some answers. No, the engine didn't last very well. I have about a .015 ridge at the top of the bores so I guess it is time to bore to .030 over. The valve seats are quite wide and a little pitted. Carbon everywhere. What a mess. I'm glad I tore into it.
