Clutch dragging, not fully disengaging, when hot.

luvrbus · October 03, 2016, 08:26:52 AM

Don Fairchild did Lin's MCI 5

bevans6 · October 03, 2016, 09:03:44 AM

Thanks! I found the Fredward threads, back in 2014. Very interesting. It seems the plate that replaces the flywheel and the SAE 1 to SAE 2 spacer ring are the hard to find items, but the transmission itself is not so hard. The driveshaft seems to end up around a foot long?

Brian

luvrbus · October 03, 2016, 09:15:57 AM

The drop ring is not hard to find they used those on trucks with the 10 speed transmissions the spacer is the tough one

Oonrahnjay · October 03, 2016, 10:34:21 AM

Quote from: bevans6 on October 03, 2016, 09:03:44 AM... The driveshaft seems to end up around a foot long?
Brian

On a Gillig low-floor transit, it's 13" long (splined slider pushed all the way in). so a foot isn't out of the range of possibilities.

bevans6 · October 03, 2016, 11:19:06 AM

What exactly is the spacer? I imagine a ring of aluminum around an inch thick, some specific depth (I recall 15/16" mentioned at one point, I think) and with holes drilled through for all of the many 3/8" bolts that hold the transmission to the rear cover of the engine. Is the flex-plate/flywheel hard to find?

luvrbus · October 03, 2016, 11:23:33 AM

No just find a flex plate with a starter ring gear the 600 series are not on the transmissions torque converter like a 740 but you can change that if you choose too,not worth the trouble IMO

Lin · October 03, 2016, 01:30:17 PM

Something worth noting is that it is sort of standard to remove the engine to get the transmission out. However, that is not totally necessary if you want to avoid it (at least with the Allison 647/644. There is a cross member under that transmission that will not allow you to just drop it, but that cross member can be cut which would allow you to drop the transmission. I had the central part of that member cut out and replaced as bolt in. I only did it to be able to remove the pan for service. However, when my 647 needed to be removed for a problem, they were able to remove my bolt-in cross piece and drop that transmission.

I had told Fredward about this, but he said that his 5a did not have the cross member there at all. Apparently, a previous owner had just cut it out completely. Although I would be uncomfortable with doing that, I do not think that he ever noticed any structural issues from the modification.

An automatic transmission will transform your bus to a coach!

luvrbus · October 03, 2016, 01:37:53 PM

I had told Fredward about this, but he said that his 5a did not have the cross member there at all. Apparently, a previous owner had just cut it out completely. Although I would be uncomfortable with doing that, I do not think that he ever noticed any structural issues from the modification.

An automatic transmission will transform your bus to a coach!
[/quote]

I don't think all the 5's had a cross member when I did mine in 88 it had no cross member and not a sign of 1 ever being there either

Lin · October 03, 2016, 05:15:08 PM

There were many versions, so it is quite possible that they were not in all of them. What would be confusing then would be the claim that the engine had to come out to get to remove transmission.

luvrbus · October 03, 2016, 05:27:10 PM

Quote from: Lin on October 03, 2016, 05:15:08 PM
There were many versions, so it is quite possible that they were not in all of them. What would be confusing then would be the claim that the engine had to come out to get to remove transmission.

It is easier to roll the engine out to do transmission or clutch work on 5 IMO

Lin · October 03, 2016, 05:42:33 PM

When United did my transmission, they estimate if they had to remove that engine was substantially higher. Of course, removing transmissions is just routine for them.

bevans6 · October 04, 2016, 04:30:49 AM

Are these the adaptors and spacers required? http://www.phxgrp.com/single.htm

Does anyone know the depth of the SAE 1 spacer? At this point I plan to fully investigate the do-ability of putting a MT647 in my "coach", make some calls to guys in the HD truck business to get some leads.

Brian

Oonrahnjay · October 04, 2016, 05:23:12 AM

Quote from: bevans6 on October 04, 2016, 04:30:49 AM
Are these the adaptors and spacers required? http://www.phxgrp.com/single.htm

Does anyone know the depth of the SAE 1 spacer? At this point I plan to fully investigate the do-ability of putting a MT647 in my "coach", make some calls to guys in the HD truck business to get some leads.

Brian

Brian, it appears that your two stock choices on the website are
Pt No. Engine Trans Offset
26-00334* SAE 1 - SAE 2 0.0ï¿½ (in steel)
26-00309 SAE 1 - SAE 2 1.0ï¿½ (aluminum)

The issue of "offset" hasn't been discussed before and I don't know what to make of the odd characters in their chart. Their website indicates a willingness to do special orders so it would be my guess that if you called and asked, they know exactly what you need and can give you an expected delivery date and cost. I'm also not sure about the choice between steel and aluminum but I'm sure that Clifford can advise.

eagle19952 · October 04, 2016, 08:26:03 AM

Quote from: Oonrahnjay on October 04, 2016, 05:23:12 AM

I don't know what to make of the odd characters in their chart.

encryption ?

proprietary ?

pay to see ?

Oonrahnjay · October 04, 2016, 11:07:10 AM

Quote from: Oonrahnjay on October 04, 2016, 05:23:12 AMI don't know what to make of the odd characters in their chart.

Quote from: eagle19952 on October 04, 2016, 08:26:03 AM
encryption ?

proprietary ?

pay to see ?

I went back and looked at the website - that's the way that the items were listed there, too. I dunno ...