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Underbody braces, turbos and more!

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PostPosted: Tue Aug 11, 2015 2:36 pm 
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Location: San Jose CA USA
This is the infamous "Lil Evil" normally aspirated T3 abomination coming out of it's 95 coffin for post mortem and refresh with a megasquirt controller.

However, I'm disappointed to read .009 on the dial indicator for crankshaft endplay, which obviously points to the crank thrust bearings.

Now, the question is "Why?"
Oil was clean and clear, tranny had steel shavings indicative of increased power being applied, coolant was primo with no discoloration, this was/is a healthy 10.5:1 motor by all indications. Pretty sure this engine was dino squeezings (as opposed to full synthetics) only.

So, for all you bookies out there, before I get inside, is this a premature thrust bearing failure?
It went together nice and tight, on the low side of factory tolerances, so something went south.

Is this my cue to upgrade all seals to "best available" and run mobil 1 from now on?

For the record: this motor redlines @ 8k, I typically shift at 7600, and I do this every single day, many times over. I'm sure the rings are toast, the bore is anyone's guess, but less than 20k miles. GTi rods, pistons, g10 97+ block, t3 top end.

Stay tuned, if nobody has advance wisdom, we'll find out in real time what happened as I get to it.

Cheers, 87octane.

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95 Metro hatch "Tequila lime" all stock
F/S 3Tech economy cam
F/S 90 Metro hatch
F/S 89 Swift GTi body only
F/S 92 Tracker 2 dr rwd stock
93 Sidekick 4 dr 1.9 vw TD, WVO conversion, 6" lift over 33's


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PostPosted: Tue Aug 11, 2015 6:18 pm 
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So what is the allowable limit? Because .009 doesn't seem like much to me.

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PostPosted: Tue Aug 11, 2015 6:36 pm 
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I just checked the specs for a GT and the STANDARD thrust play is .0044 to .0122 with a limit of .0149.

What are you worried about?

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PostPosted: Wed Aug 12, 2015 4:56 pm 
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OK, just checked the 95 FSM for the 1.0 and the above info is absolutely correct. I'm not used to that much slop from other engine platforms. This engine spent a considerable amount of run time between 7-8k rpms and every anomoly is of interest to me.

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95 Metro hatch "Tequila lime" all stock
F/S 3Tech economy cam
F/S 90 Metro hatch
F/S 89 Swift GTi body only
F/S 92 Tracker 2 dr rwd stock
93 Sidekick 4 dr 1.9 vw TD, WVO conversion, 6" lift over 33's


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PostPosted: Wed Aug 12, 2015 7:00 pm 
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I like how the low limit is .0044 hah why not just zero to .012? Maybe .0044 is the best they ever measured in the design...

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89 Swift gti
Modified B16 P29 75mm pistons,13:1CR, cultus intake, genie header, genie exhaust, 3tech head, 3tech 222/365 cams, 3tech UD pulley, megasquirt 2.0, 60mm throttle body, Aluminum flywheel


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PostPosted: Wed Aug 12, 2015 7:53 pm 
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Because if it was zero you wouldn't have oil clearance let alone be able to turn the crank at all.

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PostPosted: Wed Aug 12, 2015 9:53 pm 
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ah, yea didn't think of that
:oops:

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89 Swift gti
Modified B16 P29 75mm pistons,13:1CR, cultus intake, genie header, genie exhaust, 3tech head, 3tech 222/365 cams, 3tech UD pulley, megasquirt 2.0, 60mm throttle body, Aluminum flywheel


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PostPosted: Fri Aug 14, 2015 1:41 am 
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Joined: Tue Oct 03, 2006 10:43 pm
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Location: Texas 75150
Usually a performance pressure plate takes more effort on the clutch pedal.
Higher spring tensions on the pressure plate means higher loads on the engine thrust bearing.
Part of the performance improvements in one area wearing out parts in another area.
So you will install new thrust bearing every 10,000 miles.

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97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph.
Good, fast, cheap. You only get two.


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