Author Topic: Massive oil use, looking for suggestions  (Read 10490 times)

Offline zieg85

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Re: Massive oil use, looking for suggestions
« Reply #15 on: March 11, 2008, 09:48:16 pm »
Then I would just replace the valve seals and see what happens.

I'll give it a try.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline VileZambonie

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Re: Massive oil use, looking for suggestions
« Reply #16 on: March 12, 2008, 12:18:12 pm »
safest way to do it with the heads on is in the firing order with a breaker bar on the crank so it won't move. Pressurize the cylinder with air and change #1 and #6 seals intake and exhaust. Rotate the crank clockwise 1/4 turn do #8 & #5, 1/4 turn #4 & #7, 1/4 turn do #3 & 2. This way if you lose air pressure for whatever reason your valve won' fall completely out of the guide into the engine.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 79wideside

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Re: Massive oil use, looking for suggestions
« Reply #17 on: July 16, 2008, 10:07:08 am »
Did you get a chance to try the stem seals yet? Just curious, as mine is doing the exact same thing!

Offline zieg85

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Re: Massive oil use, looking for suggestions
« Reply #18 on: July 16, 2008, 10:55:32 am »
Did you get a chance to try the stem seals yet? Just curious, as mine is doing the exact same thing!
No, the engine needs rebuilt.  The PO neglected the oil change intervals it seems.  The main/rods rattle on start up for a few seconds till the oil pressure builds up.  I am working on getting a replacement car for my son that gets better gas mileage.  Goes through a quart every 4-500 miles but runs exceptionally well.  Just took it this weekend on a 240 mile round trip, didn't miss a beat and got close to 20 mpg, that is with me driving and all rural 65 mph or slower, but consumed 1/2 quart. 
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline 79wideside

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Re: Massive oil use, looking for suggestions
« Reply #19 on: July 16, 2008, 04:46:14 pm »
Mine has that same rattle too! I am thinking the same way you are, get another engine!