Re: 90 ZR-1 #2273 - To be rescued
 

nice story, good work!

tell me pls clipers are from porsche 911?

Re: 90 ZR-1 #2273 - To be rescued
 

Thanks!
They are indeed the "big red" from the 911 (993). The kit is made by Movit in Germany.

Re: 90 ZR-1 #2273 - To be rescued
 

ok, thanks.

Re: 90 ZR-1 #2273 - To be rescued
 

As mentioned before, I've had some idle issues. A couple days ago I picked up the investigation with the following results. The car idles steady at approx. 750 RPM when the fans are running. If I plug the bore to the primary blade, the idle reduces to 700. IAC count obviously at zero.
I removed the TB for another inspection, and it's obvious that there is quite a bit of wear on all the plates. The secondary blades show a lot of light around the shafts, and the primary lights up everywhere.
Instead of going through with the whole DAG-procedure, I've now packed up the TB and sent it of to the US for Marc to work his magic. Must say I'm curious if he'll be able to mend it.

I've also removed the exhaust, as the pilot bearing is next on the list of jobs.


The daily effort is rather limited due to the 5°F in my garage.

Re: 90 ZR-1 #2273 - To be rescued
 

Primary and secondary blades

https://i.imgur.com/K87RPOT.png

https://i.imgur.com/8dqaUDn.png

Re: 90 ZR-1 #2273 - To be rescued
 

Cool story man. I love reading stuff like that. Looks to me like it's in good hands this time.

Re: 90 ZR-1 #2273 - To be rescued
 

That will do it. Good call sending the TB to Marc. I don’t think is so much wear as it is the DAG was either wiped off or it somehow came off. My 181k mile car shows very little light through the secondary throttle Plates. If wear were an issue mine should certainly show it. I think in most cases it just over zealous cleaning.
H
:cheers:

Re: 90 ZR-1 #2273 - To be rescued
 

This stuff works like DAG...I believe its the same material essentially
https://www.grainger.com/product/41P...180222234249:s

Re: 90 ZR-1 #2273 - To be rescued
 

Might be just the DAG on the secondary blades, but as the photo shows indirect light, the gap/axial clearance is rather large.
The primary is however clearly worn, though the light makes it impossible to see on that pic. It's got the same wear as Phil (Jagdpanzer) had, just not quite as bad.

Throttle Body Primary Blade wear issue
http://i540.photobucket.com/albums/g...ps6zjhkzli.jpg


I've got a bottle of Molycote D321r laying around (DAG), but I'll leave it on the counter until I've seen what Marc can do with it.

Re: 90 ZR-1 #2273 - To be rescued
 

Slightly warmer today, allowing some minor progress. Need expert opinions on the condition of the clutch/PP/Flywheel condition. Thoughts?

The clutch plate measures approx. 6.5mm thickness. Whats the thickness of a new plate?

Couldn't really see too many signs of the pilot bearing rotating inside the crank, and throwout bearing feels surprisingly good. Nice and tight.

There is no play between the masses of the flywheel, but it does allow about 1/2" movement between them, some force required.

https://imagizer.imageshack.com/v2/8...923/TEMSRN.jpg
https://imagizer.imageshack.com/v2/8...923/GKQvd7.jpg
https://imagizer.imageshack.com/v2/8...922/tJYN8i.jpg
https://imagizer.imageshack.com/v2/8...924/i0VEW1.jpg
https://imagizer.imageshack.com/v2/8...922/ab3e8a.jpg
https://imagizer.imageshack.com/v2/8...924/CC022y.jpg
https://imagizer.imageshack.com/v2/8...924/PzDQsH.jpg
https://imagizer.imageshack.com/v2/8...924/aYy0bi.jpg

Re: 90 ZR-1 #2273 - To be rescued
 

Expert opinion received from Bill Boudreau,

Re: 90 ZR-1 #2273 - To be rescued
 

Your 6.5mm disc thickness translates to .255 inches. As Bill notes .320 is the standard for a new disc. As I understand it minimum thickness is .230. So your disc is about done.

Will you simply replace the disc or will you take the opportunity to install a light weight flywheel and sprung hub disc?
H
:cheers:

Re: 90 ZR-1 #2273 - To be rescued
 

The disc seems to be due for replacement, yes. It seems Bill has faith in the pressure plate and TO bearing, but he dares not give an estimate on the remaining life span of the DM flywheel.

Light flywheel is not an option for me. I've gone that way before on another project, and I regretted it ever since. The rattle and loss of driveability is just not worth it. I see Jerry's has a couple DM flywheels left, and I must say it's tempting, but it's not a cheap option. Right now I'm just looking to see if I can find all the right parts and their price, to estimate a total cost.
The OEM clutch disc also seems hard to find.

Re: 90 ZR-1 #2273 - To be rescued
 

Got the TB back from Haibeck this week, and it's obvious that there is just so much one can do when the blades are getting worn. You can still see right past the blades close to the shafts. Maybe I'll have to attack it with the Molycote D321-R as well, to Band-Aid the lost DAG. TPS had also gotten damaged during shipping back to me, so I'll need to replace and calibrate that one as well.
Too bad, really, as I was hoping for some kind of magical repair resulting in a perfect seal. Maybe one has to go for the 63mm blades?

Re: 90 ZR-1 #2273 - To be rescued
 

Greg VanDeventer can repair just about any problem on a throttle body, including making new blades ranging from stock to 63mm & any size in between, shaft bushings, boring the T-body itself, etc. Personally, I would do the repairs before going through the molycoat/DAG process. Your T-body likely needs more attention than that.

Re: 90 ZR-1 #2273 - To be rescued
 

I am rather upset with myself for not knowing of this gentlemen you mention, before I spent over $600 (incl. $150 in shipping) to repair the TB. What a waste..

How can I get in touch with Mr. VanDeventer?

Re: 90 ZR-1 #2273 - To be rescued
 

Marc does excellent work & is highly respected in the ZR-1 community. Please do not take my suggestion wrong. I had no idea that you had Marc do a rebuild on your throttle body. You should contact Marc with your concerns. I have no doubt he will address them to your satisfaction.

Re: 90 ZR-1 #2273 - To be rescued
 

There is absolutely nothing wrong with the work Marc did on the TB, and it may very well be that the blades seal enough for the IAC to control the idle, if no other leaks are present. I'm sure he would've told me if he actually thought further work was necessary.

I probably failed to inform him of the extent of repair I was looking for.
He has been vastly helpful throughout my restoration project, and I don't really wish to bother him any more with it.

Re: 90 ZR-1 #2273 - To be rescued
 

I doubt Marc considers it a bother.

Re: 90 ZR-1 #2273 - To be rescued
 

I have some original throttle plates

Re: 90 ZR-1 #2273 - To be rescued
 

Now that I have my ZF laying on the workbench, is there anything else I should look at while "in there"? I've already checked the back-up light switch for proper movement, and plan to freshen up the ground points where the wires collect on the back of the engine. The transmission will be installed with fresh oil and new drain/fill plugs (vw brand). Drive shaft is getting new joints.

Re: 90 ZR-1 #2273 - To be rescued
 

Think about replacing the tail shaft seal and check the yolk to the driveshaft for play on the output shaft splines. ZF Doc has the specs for yolk play on his site. That said, unless it’s very high mile car, has been abused or both it’s unlikely the yolk will be an issue.
H
:cheers:

Re: 90 ZR-1 #2273 - To be rescued
 

Thanks Hans, I'll check the specs.
Car's got 70k miles.

Re: 90 ZR-1 #2273 - To be rescued
 

Sorry i never responded to your inquiry. No I don't have a forum thread but some of the same players are involved. I had a transmission built by Bill Boudreau, and Marc Haibeck gave advice on proper clutch, pressure plate, etc. Marc also refinished the top end of the motor in a bright silver powder coat. New brakes and rotors, wheels and tires and a '94 exhaust was installed. Car was repainted Mellon Copper Metallic and I had the seats redone. A few minor details to do and I should be all set for Carlisle this summer. I have problems posting pictures to this forum so I have posted some on Corvetteforum and CorvetteActionCenter.

Re: 90 ZR-1 #2273 - To be rescued
 

Is this the one?
https://www.corvetteforum.com/forums...1-update-1.jpg
https://www.corvetteforum.com/forums...1-update-2.jpg

If so, the car looks great. Love the color. I really would've loved to have the top end re-painted as well, but not sure who I would trust with such a task on this side of the Atlantic.

Re: 90 ZR-1 #2273 - To be rescued
 

Yes that is my car, it has been a lot of fun. I forgot to mention Jerry Downey also contributed. A little more interior work and I’m done.

Re: 90 ZR-1 #2273 - To be rescued
 

Joe,

Good to see u back in a ZR. U should come to Haibeck’s this Sunday.

Re: 90 ZR-1 #2273 - To be rescued
 

Dom:

I have it on my calendar, but if I come over I will either drive the ‘12 or my daily driver. Got the seats back out of the ZR-1 in preparation of a modification.

Re: 90 ZR-1 #2273 - To be rescued
 

Gorgeous beast. Curious to se your interior mods when complete.

I'll finally be able to make som progress myself, as I've just received some parts from Jerry and Kurt White.

Complete NOS clutch kit. DM Flywheel from Jerrys. Throw out bearing, pressure plate (deep dish) and clutch disc from Kurt.

https://imagizer.imageshack.com/v2/8...924/Mie98H.jpg

Can't wait for work to commence on my new garage. The old one is getting rather cramped.

https://imagizer.imageshack.com/v2/8...923/YaOPKd.jpg

Re: 90 ZR-1 #2273 - To be rescued
 

That is a gorgeous car and the color match is dead on. It’s a shame GM didn’t get this color on a Z.

Re: 90 ZR-1 #2273 - To be rescued
 

Thanks! Nothing special with the interior, just freshening it up, this project was all about the exterior color and keeping the car alive. When I purchased it, it was pretty "worn".

Re: 90 ZR-1 #2273 - To be rescued
 

Are you replacing the foam/leather on the seats yourself?

Re: 90 ZR-1 #2273 - To be rescued
 

Yes, I purchased the seat covers through Corvette America and ordered their foam kit also. The foam and covers were installed by a shop recommended by my painter. The seats turned out great. The foam is more dense than the factory foam, especially after 27 years, but they are comfortable and look fantastic.

Re: 90 ZR-1 #2273 - To be rescued
 

Do you have any pics of the seats as they are now? I bought my stuff from Corvette Central and wasn't really satisfied with either the foam or the leather. I think I posted som pics of them somewhere in this thread.

Re: 90 ZR-1 #2273 - To be rescued
 

You actually ordered and received parts from Kurt White! Your a brave man! Looks like good stuff though. No doubt pricy as all things from Kurt are.
H
:cheers:

Re: 90 ZR-1 #2273 - To be rescued
 

Pricey indeed. The man has a few to many balls in the air at once, so persistence is necessary to acquire parts from him. He is however still in business, and has quite a lot of unique parts in store.

Must say I was quite relieved to open the parcel and find exactly what I had ordered. He gets alot of poor feedback, but (knock on wood) I've yet to have a bad experience purchasing from him.

Re: 90 ZR-1 #2273 - To be rescued
 

Do you install the rubber boot on the transmission tunnel first, and then bolt it on to the transmission once it's installed?

Re: 90 ZR-1 #2273 - To be rescued
 

The rubber boot mounts to the transmission. I always found it easier to install it on the trans first and mount the trans with boot into the car. Could be done either way I suppose.
H
:cheers:

Re: 90 ZR-1 #2273 - To be rescued
 

The only issue I can imagine, would be wrapping the boot over it's locator frame on the driver's side. Seem to remember it was a rather tight fit? But if you say it's possible I'll just leave the boot on the tranny.

Re: 90 ZR-1 #2273 - To be rescued
 

Joe’s seats looked awesome. Better than new.