Author Topic: The T56 conversion into a 70 Mach 1 (Read 2933 times)

RyanG85 · « **Reply #75 on:** July, 24, 2010, 02:54:30 PM »

Interesting... I guess I'll disassemble mine before the final install and make sure those seals are good! Thanks for the update.

buening · « **Reply #76 on:** July, 24, 2010, 03:14:04 PM »

Mine worked fine at first, so the seals were good out of the box. It built pressure fine and had the proper bearing throw. I'm not sure if something inside got kinked or what the crap happened. All other seals looked great. If you are using a McLeod, be sure to read the directions carefully and make sure you use NON-Synthetic DOT3 only brake fluid. Apparently synthetic fluid is not compatible with the seals. I had to look everywhere for the non-synthetic stuff.

65fast · « **Reply #77 on:** July, 27, 2010, 06:19:33 AM »

That's a bummer! At least you have a taste of what it's like to give you some motivation to get the final few issues resolved.

Did you check bellhousing alignment when you installed the bell? I wonder if it being off a few thousands would affect the seals under pressure if the TOB isn't exactly square to the clutch...

buening · « **Reply #78 on:** July, 27, 2010, 07:25:52 AM »

Quote from: 65fast on July, 27, 2010, 06:19:33 AM

That's a bummer! At least you have a taste of what it's like to give you some motivation to get the final few issues resolved.

Did you check bellhousing alignment when you installed the bell? I wonder if it being off a few thousands would affect the seals under pressure if the TOB isn't exactly square to the clutch...

Yep, see Reply #43 for bellhousing alignment. I'd have preferred the final issues to not involve the bearing though :lol

McLeod noticed a green grease on the bearing pictures and asked if I added grease, which would contaminate the brake fluid in the piston. The green grease is actually leaking from the bearing piece as far as I can tell. Below are pictures illustrating this grease. I'm still waiting on the final word from ModernDriveline, who is working with McLeod on this issue. Bruce has been great to work with, and isn't pleased with this immediate failure on a newly redesigned throwout bearing.

Note the green grease at the interface of the inner bearing race and the black piston

Front of the bearing with grease visible

Backside of the bearing. Note the beading up of brake fluid near the joint of the inner race and the black seal

Green grease line on piston from leaking bearing

another pic of the piston with the grease

Basically, from my armchair analysis the bearing leaked the grease which then got into the piston cylinder. That contaminated the brake fluid and caused the cylinder walls to have remnants of grease, which likely increased friction on the cylinder walls and caused the seal to blow. Thats my theory anyways

RyanG85 · « **Reply #79 on:** July, 27, 2010, 07:39:12 AM »

Interesting! Keep this up to date as I will be pulling my trans again soon after final mock up. Would like to eliminate all possible problems before final assembly.

buening · « **Reply #80 on:** July, 27, 2010, 07:42:18 AM »

Quote from: RyanG85 on July, 27, 2010, 07:39:12 AM

Interesting! Keep this up to date as I will be pulling my trans again soon after final mock up. Would like to eliminate all possible problems before final assembly.

Will do! What is tricky is the grease was not visible when I pulled it out of the box, as can see from my original picture straight out of the box

Only after a little bit of use did the grease appear. :po Soooo, unless you've ran your trans through the gears you probably won't find any grease until then....which is likely too late since everything is installed. For all I know my bearing may be a fluke and you won't have problems. Who knows!

buening · « **Reply #81 on:** July, 28, 2010, 05:34:50 AM »

Well I heard back and McLeod wants me to send them the assembly for failure analysis. They claim this is the first failure they've had with the new revised bearing. Leave it to me to get the dud

RyanG85 · « **Reply #82 on:** July, 28, 2010, 07:04:25 AM »

and in the mean time????? Are they going to send you one to replace it or do you sit and wait for shipping/testing/shipping....etc etc....

I'm feeling your pain! That sucks!

buening · « **Reply #83 on:** July, 28, 2010, 07:45:51 AM »

I'm waiting unfortunately. They are either going to replace the bearing or rebuild it and send it back to me depending on what they determined went wrong. On one hand I hope it is a fluke, but then again I'd hate for them to just ship me a new bearing today without seeing what went wrong. I don't want to install another one only for it to fail too.

joesgt281 · « **Reply #84 on:** July, 28, 2010, 08:43:58 AM »

If you get to the point where you are ready to throw in the towel on the hydraulic setup, I can tell you that the Ron Morris cable setup in my 67 is working well so far.
This being after a good bit of track time on the road course, drag strip, and street.
Hope you get it worked out soon.

buening · « **Reply #85 on:** July, 28, 2010, 09:03:57 AM »

Thanks Joe. If this doesn't work I'll try the external slave thing, since I already have the M/C and everything. If it blows up then I'm going back to automatic

Sluggo · « **Reply #86 on:** August, 02, 2010, 10:59:16 AM »

RMP does not offer a cable setup for a 69-70 anyway. I inquired about it and it does not seem like they have plans to do so either.

buening · « **Reply #87 on:** August, 02, 2010, 12:00:58 PM »

ModernDriveline has a kit, FYI http://moderndriveline.com/catalog/clutch_cables.htm

buening · « **Reply #88 on:** August, 12, 2010, 04:24:51 AM »

Here is an update that I received from Bruce at Moderndriveline:

I just got off the phone with the tech the did the repair. He replaced the inner/back housing and replaced the o-rings with a different model. They are also polishing the piston to make is smoother. The bearing was replaced as well.

It sounds to me like it was not something I did but the bearing itself failed. I'm expecting shipment of the bearing today and I'll be putting everything back together for a 2nd time this weekend. Cross your friggin fingers! :scar

buening · « **Reply #89 on:** August, 15, 2010, 05:55:26 PM »

Well I got the bearing in on Friday and spent part of the weekend getting everything back together. I drove it around town, trying not to venture too far from home. I'm a bit gunshy since the first one failed so quickly. I'm afraid of going too far away and having it blow up again :rp

The only thing I have left to finish this install is to fabricate an engine crossmember. With the engine lowered and relocated, it's gonna have to be a custom piece.