1991 RT/TT - First Failure in 230K / 17 years - Page 11 - 3000GT/Stealth International Message Center

cbatters · 08-25-2008, 08:36 PM

Quote:

Originally Posted by cbehnken

rev it out to about 6K. If the oil pressure starts DROPPING instead of going up it is the pump. Same thing happened to my old NA with much less miles.

When you rebuild be sure to open up the oil pump. You'll be amazed at the wear the gear has cut into the pump case.

Looking forward to pics

Hsppy to open it up and inspect.

Back in 2005 @180K miles, my oil pressure would hit bypass pressure at around 4500 RPM with fully warmed engine and 20W50 oil.

cbatters · 08-25-2008, 08:38 PM

Quote:

Originally Posted by stans3000gt

looking forward to it, it would be more interesting to check it out in person if u ever in the area or want to come to a meet we have that would be awesome.

I drive by Newton every day on the way to and from work. Happy to hook up sometime.

cbatters · 08-27-2008, 08:06 AM

215 miles on the bearings and all seems well (although oil pressure is obviously not correct.)

Getting my normal 23 MPG driving back and forth to work.

Planning to flush oil tonight and then send sample for analysis after 500 miles.

Any bets for/against me getting to 500 miles? (crank journal was definately worn but not rough. I still think .004" clearance with 25mm oversize bearing may provide the cushion I need for the bearing to survive for a while.)

Clint

stans3000gt · 08-27-2008, 08:20 AM

Quote:

Originally Posted by cbatters

I drive by Newton every day on the way to and from work. Happy to hook up sometime.

Let me know if you are around sometime this week on thursday which is tommorow, wow this week flew by. Glad to hear you are 215 and its fine. To me it sounds fairly normal to have that kind of wear and clearence, I mean I saw a stealth with 290K miles on it, it wasnt a TT just dohc an old guy has it and he was pretty worried about the oil pressure being VERY LOW, I still see him driving around and no work done on the car..... He just uses very thick oil and adds some additives. I think this car will take you for atleast another 15K miles from seeing how much you know about it. I would just drive it and in the meantime get a nice engine ready to drop in it, I am not sure what is your situation on a DD. Also sort of interested in the oil samples post those up.

OhioSpyderman · 08-27-2008, 08:41 AM

Clint, I'm assuming you're judging your oil pressure by an after market gauge?

How low is low? Does the low oil light flicker?

If you're judging by the stock gauge and want to know for SURE what your pressure is, I'd be happy to send you the "temporary" external gauge I built up. (remove stock sender, screw in my gauge [with a few feet of rubber hose on it] and measure away!) I actually have two gauges, one for startup measurements and another for warm idle that swap in and out...

Bob.

EDIT...nevermind, I'm an idiot. I just scrolled up to see that your using MMC'd to do your measurements....

cbatters · 08-28-2008, 06:22 PM

Quote:

Originally Posted by OhioSpyderman

Clint, I'm assuming you're judging your oil pressure by an after market gauge?

How low is low? Does the low oil light flicker?

If you're judging by the stock gauge and want to know for SURE what your pressure is, I'd be happy to send you the "temporary" external gauge I built up. (remove stock sender, screw in my gauge [with a few feet of rubber hose on it] and measure away!) I actually have two gauges, one for startup measurements and another for warm idle that swap in and out...

Bob.

EDIT...nevermind, I'm an idiot. I just scrolled up to see that your using MMC'd to do your measurements....

No flicker - pressure just does not track RPM the way it should. (Oil pressure should track ratio of RPM until the bypass valve opens but it doesn't. i.e. oil pressure at 4000 RPM should be 2X pressure at 2000 RPM)

cbatters · 08-29-2008, 08:48 AM

Unfortunately, there may have been signs at 180K (53K miles ago) that there was a problem looming with oil pump (see increased levels of iron and bearing material) Unfortunately, I did not sample at 200K. If I had sampled at 200K and saw even higher iron, it would have pointed me to the oil pump well in advance of bearing failure. (See report below)

cbatters · 08-30-2008, 04:16 PM

Medium size favor. Part number and cost of two front -> rear power steering lines.

Can someone with CAPS loaded get me a part number for the two power steerring lines that go from the front of the car all the way to the rear along the passenger side of the car.

Trying to figure out how much they cost but I could not find the part or cost when looking at the online Mitsu catalog. I either need to order them, or take mine off and have the hoses replaced.

Clint

OhioSpyderman · 08-30-2008, 05:35 PM

Clint,

Here's what I found..

MB631712 Hose Steering Oil RESEVIOR

The other two lines are labeled as RETURN and SUCTION, but unfortunately CAPS shows "**NO DATA**" for both of these parts...

Sorry, I tried.

Bob.

Drweldin · 08-30-2008, 06:01 PM

Quote:

Originally Posted by cbatters

No flicker - pressure just does not track RPM the way it should. (Oil pressure should track ratio of RPM until the bypass valve opens but it doesn't. i.e. oil pressure at 4000 RPM should be 2X pressure at 2000 RPM)

Clint,
Can you elaborate on the bypass valve, and how that works...?

08-27-2008, 08:06 AM	#103 (permalink)
cbatters Member: Burned valve club Join Date: Jun 2002 Location: Stoughton, MA Drives: 91 Stealth RT/TT Trader Rating: (12)	Re: 1991 RT/TT - First Failure in 230K / 17 years 215 miles on the bearings and all seems well (although oil pressure is obviously not correct.) Getting my normal 23 MPG driving back and forth to work. Planning to flush oil tonight and then send sample for analysis after 500 miles. Any bets for/against me getting to 500 miles? (crank journal was definately worn but not rough. I still think .004" clearance with 25mm oversize bearing may provide the cushion I need for the bearing to survive for a while.) Clint

08-29-2008, 08:48 AM	#107 (permalink)
cbatters Member: Burned valve club Join Date: Jun 2002 Location: Stoughton, MA Drives: 91 Stealth RT/TT Trader Rating: (12)	Re: 1991 RT/TT - First Failure in 230K / 17 years Unfortunately, there may have been signs at 180K (53K miles ago) that there was a problem looming with oil pump (see increased levels of iron and bearing material) Unfortunately, I did not sample at 200K. If I had sampled at 200K and saw even higher iron, it would have pointed me to the oil pump well in advance of bearing failure. (See report below)

08-30-2008, 04:16 PM	#108 (permalink)
cbatters Member: Burned valve club Join Date: Jun 2002 Location: Stoughton, MA Drives: 91 Stealth RT/TT Trader Rating: (12)	Re: 1991 RT/TT - First Failure in 230K / 17 years Medium size favor. Part number and cost of two front -> rear power steering lines. Can someone with CAPS loaded get me a part number for the two power steerring lines that go from the front of the car all the way to the rear along the passenger side of the car. Trying to figure out how much they cost but I could not find the part or cost when looking at the online Mitsu catalog. I either need to order them, or take mine off and have the hoses replaced. Clint

08-30-2008, 05:35 PM	#109 (permalink)
OhioSpyderman Former ROTY :-} Join Date: Oct 2000 Location: Dayton, Ohio Drives: Back and Forth :) Trader Rating: (45)	Re: 1991 RT/TT - First Failure in 230K / 17 years Clint, Here's what I found.. MB631712 Hose Steering Oil RESEVIOR The other two lines are labeled as RETURN and SUCTION, but unfortunately CAPS shows "NO DATA" for both of these parts... Sorry, I tried. Bob.

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