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Join Date: Aug 2004
Location: georgia
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oil piston woes

Okay, so i took a week off of work to build the 2.7 and I am almost there. Currently putting the oil relief pistons in...I have two pistons, identical, no brainer where they go. But then I have two different lengths of springs and two different plugs. I am pretty sure the smaller diameter plug goes on the side of the case. (it fits the casting better) But the two plugs have different depth wells where the spring sits. Do i put the shorter spring in the deeper well? The difference in well depth is about the same as the difference in spring length. If I sit the two on the workbench and measure from the shoulder to the end of the spring they are roughly equivalent when I have short spring in shallow well and long spring in deep well. Do I just have a couple of mismatched (yearwise) caps and springs?

Eli
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76 Targa patched 2.7

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Old 12-20-2004, 11:12 AM
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If you use the short spring with the deep plug is there very little pressure on the piston? Same problem I ran into I think, this is a good question. I hope someone can help us both out because I have the same question?

Craig
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Old 12-20-2004, 02:35 PM
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with my highly calibrated, completely inaccurate sense of feel, the long spring in shallow well seemed to have alot of tension, whereas the other one didnt have as much.

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76 Targa patched 2.7

I have severe while-you-are-in-there-itis.
Old 12-20-2004, 03:11 PM
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I also noted that only one spring and plug is listed on the pelican catalog.
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76 Targa patched 2.7

I have severe while-you-are-in-there-itis.
Old 12-20-2004, 03:12 PM
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Eli & Craig

The longer spring goes vertical from the bottom of the case and should have a 'guide sleeve' that goes in it (This stops it from snaking in the hole) (waynes book page 138). The plugs were different (I cant say which way :-( but were superceded to the same part 999 064 226 02), Id suggest you buy 2 new plugs because I think the plugs were used to alter the effective spring lenght and now its done in the spring, I assume because you have the diffent springs you have done the iol bypass mod

HTH

Neven
Old 12-22-2004, 07:01 PM
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I dont have a guide sleeve inside of the spring, there wasnt one when i removed the plug. Of this I am certain. I will order new plugs though. And a guide sleeve if our host has it, otherwise I guess I will fabricate something

Eli
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76 Targa patched 2.7

I have severe while-you-are-in-there-itis.
Old 12-23-2004, 06:46 AM
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Eli

Are the pistons the old or new type? (new are solid, old have holes in the side of them), The guide sleeve is http://www.pelicanparts.com/cgi-bin/dbsql/db.cgi?db=partsearch&uid=default&description=930107533&view_records=Click+to+View+Parts&re=on&mh=20

HTH

Neven
Old 12-23-2004, 08:18 AM
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Read the section in the Engine Rebuild book on this - you can run your engine out of oil pressure if you use the wrong pistons / springs with the oil bypass modification...

-Wayne
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Old 12-23-2004, 11:37 AM
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new type, no holes.

Eli
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76 Targa patched 2.7

I have severe while-you-are-in-there-itis.
Old 12-24-2004, 11:21 PM
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