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Any 7.3 Ford experts?


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  #1  
Old 04-30-2012, 03:16:40 AM
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Default Any 7.3 Ford experts?

I have been working on this 1990 F350 7.3 for several months. I have replaced a lot of parts. It had been setting for 7 years. The main issue left is it leaks oil like crazy from the rear main area. I looked up top and it doesn't look like it is running down. I replaced the rear seal when I replaced the flywheel. It didn't look that bad. Leaks the worce when I am going down the highway. I checked the crankcase breather thing, seems ok, I could blow through it easy enough. I have sunk a lot of money and time into this truck and it seems the problems never end. I want to sell it cause I'm tired of working on it, but I wouldn't get half my money back. Anybody have any info on what or why it still leaks. It had the leak when I bought it, before replacing the seal. I have changed many an oil seal, but this is kicking my rear.
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Old 04-30-2012, 05:05:01 AM
Roland Hayes Roland Hayes is offline
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Default Re: Any 7.3 Ford experts?

Sounds like the rear main oil gallery plug is loose, spanner time!
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Old 04-30-2012, 07:07:06 AM
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Default Re: Any 7.3 Ford experts?

I'm sure you checked the crankshaft for wear at the seal area.
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Old 04-30-2012, 12:02:58 PM
Smokin Bob Smokin Bob is offline
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Default Re: Any 7.3 Ford experts?

I agree with what MoRo said. About 10 years ago, a friend of mine had the same problem. The crank was worn where the seal rides on it. He bought a seal kit from FelPro that had a spacer that you inserted into the seal boss before the seal itself so that the seal was effectively re-positioned on the crank. It worked for about 10,000 miles and then leaked again. Turned out, the main bearings were worn enough that the crank was no longer turning perfectly true and wallowed out the seal. How many miles are on that engine? The mains may be worn, especially if it was used for heavy work.

Bob
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Old 04-30-2012, 02:32:49 PM
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Default Re: Any 7.3 Ford experts?

Those 7.3's are a throwaway motor, 400,000 is about all they're good for.
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Old 04-30-2012, 09:45:53 PM
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Default Re: Any 7.3 Ford experts?

Couple of thoughts:

1. There is a seal between the CDR valve and the intake. Available through Ford, and it's cheap.
2. CDR drops down into the valley pan. Verify that connection is complete and the seal into the valley pan is good (if I remember right - the turbo'd ones are different).
3. While the CDR is off check to see if it's good. Should only be able to blow through it in one direction.
2. The rear valley pan is sealed with hylomar. Could be there If a valley pan was done before you got it. (once it seals with Hylomar it's sealed).
3. There is a drain in the valley pan that drains onto the starter. If you are getting oil on your starter it could be a fuel injection system related leak.
4. Valve covers are a leaking point
5. There are several small plugs tapped into the oil galley towards the back of the block. Verify those are sealed and tight.
6. There is a oil pressure switch back there that has been known to leak.
7. The advice here regarding the rear main seal is sound. Is it leaking from the flywheel inspection cover? That seal should always be replaced with the kit that comes with the seal wear ring. From everything I've ever seen, if it starts leaking from the rear main on the 6.9 7.3 you need to install a wear ring.

Do a search on your 6.9/7.3 related problems here:

Oilburners.net

Good luck and please post back on your progress,

Paul

---------- Post added at 08:45 PM ---------- Previous post was at 08:40 PM ----------

I have a recycled 6.9 in my pickup. Quite happy I didn't throw it away.

Paul
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Old 04-30-2012, 10:08:37 PM
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Default Re: Any 7.3 Ford experts?

When I put the rear seal in I pushed it in about 32nd further so the seal would not ride in the same spot. The CDR valve is the one that attaches to the valley tray by rubber hose and bolts to the intake, right? I can blow through it both directions. Truck shows 86,000 miles, but I'm sure it has turned over a time or 2. I do not relish the idea of pulling the transmission AGAIN, and there is no way to know if after doing that it won't leak again. Engine has good oil pressure. This is my first diesel, and maybe my last.
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Old 04-30-2012, 11:36:38 PM
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6point9diesel 6point9diesel is offline
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Default Re: Any 7.3 Ford experts?

Can you pull the flywheel inspection cover and see if it is certainly leaking from inside here? If you can't tell I think you should degrease and pressure wash it to see if you can't find the leak easier.

That is the CDR valve. If it is leaking as much oil as you say that's unlikely the culprit...I mention it because it's a likely leak spot.

The oil cooler could be another area of concern. Look where the tube seals between the two castings on either end. Also where the castings seal against the block.

I'm hoping your oil sending/switch is leaking. That's the easiest and cheapest thing to fix.

Do you have a manual oil pressure gauge inside the cab? That tube is another likely canidate.

Good luck, and again please post your results.

Paul
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Old 05-01-2012, 09:02:25 AM
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Default Re: Any 7.3 Ford experts?

It has a new oil pressure sending unit. The oil is running down the back of the pan. It's hard to get a good look at the rear seal because the exhaust pipe is in the way. Everything outside the bell housing is dry.
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Old 05-01-2012, 10:24:15 AM
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Default Re: Any 7.3 Ford experts?

Bet it's the seal
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Old 05-01-2012, 12:56:59 PM
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Default Re: Any 7.3 Ford experts?

I do not know on the 7.3's but I have seen the camshaft plugs leak. Oil leaks can be hard to find. If it is the crank seal leaking, the main bearings need to be checked.
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Old 05-01-2012, 03:15:13 PM
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Default Re: Any 7.3 Ford experts?

Vernon, I found a leaking camshaft plug on 5.0 by using mechanic's adjustable mirror on a telescoping wand.
There was a recall on 5.0 camshaft plugs. If I recall, synthetic oil deteriorated them.If the same materials were used on 7.3 - ?
A thought - hoping your leak is not at crankshaft seal.
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Old 09-26-2012, 12:21:23 PM
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Default Re: Any 7.3 Ford experts?

In the eighties and nineties, I ran my own shop and rebuilt many 6.9 and 7.3 litre engines. Most of these were gutted by poor air cleaner design and jobber elements. The blocks are reboreable, a couple of oversizes of pistons are available. These engines are definitely not "throwaway"
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Old 04-04-2013, 07:24:03 PM
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Default Re: Any 7.3 Ford experts?

Well who every said that the 7.3 was a throwaway dont know what thay are saying. now the 6.0 is but the7.3 i know a lot of people that has well over 600000. on them pulling a 36 ft. camper. with all the people that is out on the road with campers and quick hull trucks the 7.3 will out do all of them. i do know one f350 with the 7.3 that has over 1000000 miles on it. and i do know that to be true becouse i got the truck with 218000. miles and i put the rest of them on it. now with the oil leak on the 7.3 it is prob. the rear main. i had to replace my at about 300000. and it started leaking about 5000 miles. but when i put it in the next time i got a speedsleve from bearings Inc. made by CR seals co. and put a new rear main in and it has just stared last yr. but i do have 1000000. miles on it. and its going thure about 1 1/2 qts in 6000 miles. but i am like you i dont look forward in puting a new one in. I am alot older now and dont move like i did at one time. but the truck is a 1995 F350 duley 4Dr. and i think its got more miles in her.[ These is not like the dead horse chevy trucks LOL ]
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Old 04-04-2013, 07:42:09 PM
Ed Sparks Ed Sparks is offline
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Default Re: Any 7.3 Ford experts?

They sell a fluorescent dye that can be put in the oil and checked with a black light to pinpoint the source of the leak.
Clean up the oil and run the engine and then check with the black light to find the exact source of your leak.
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Old 04-04-2013, 07:44:01 PM
Ray Freeman Ray Freeman is online now
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Default Re: Any 7.3 Ford experts?

Its worth double checking the plug in the high pressure oil gallery behind the cylinder head. Mine leaked there and looked like a rear main leak. The plug has a seal on it that fails on some. Not much fun to get to
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Old 04-05-2013, 11:10:31 AM
RSCurtis RSCurtis is offline
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Default Re: Any 7.3 Ford experts?

It's a 1990- four years before the Powerstroke was released.
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Old 04-05-2013, 05:46:14 PM
Dirk Jr Dirk Jr is offline
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Default Re: Any 7.3 Ford experts?

Rear main seal.
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Old 04-09-2013, 10:22:14 PM
GHanners GHanners is offline
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Default Re: Any 7.3 Ford experts?

have you check in the intake valley any leaks on top side the will drain & leak through a hole in the back and come out behind the flywheel
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Old 04-28-2013, 10:10:36 AM
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Default Re: Any 7.3 Ford experts?

It turns out the dust shield has vibrated a small hole into the oil pan. Put some epoxy on it and so far so good.
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