TR7 & TR8 Mailing List

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11
Wedge List / Re: Wiper Washer Pump Xreference
« Last post by Bill on April 20, 2019, 10:41:30 AM »
You are correct on the Jag.B  I will have to make a couple more calls.
12
Wedge List / Re: Clutch issue?
« Last post by Randy Ezzell on April 20, 2019, 10:36:09 AM »
The pivot pin for the TR8 is longer than the TR7. Enough so the clutch in

an 8 won't be able to disengage if a pin from a 7 is installed. It was a

frustrating lesson.

Randy Ezzell80 TR8 DHC Calif spec

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13
Wedge List / Re: Clutch issue?
« Last post by Todd Kishbach on April 20, 2019, 07:08:42 AM »
Start by trying to bleed the clutch.  Pump the pedal a couple of dozen times

and have somebody look and see if tiny bubbles start rising up in the master.

If so keep doing this until they are almost completely done. On really

stubborn ones, I have done this and then done it again several hours later,

and then again after that.  Walking away from in allows the smaller bubbles to

form into larger bubbles.  Then bleed the clutch by pushing pedal down and

just barely cracking open the slave bleeder.  Then close quickly.  Lift pedal,

pump a few times and hold, crack bleeder, repeat four or five times and then

check fluid level in master.  If this doesnbt correct the problem, then

something is going on inside.  When you lighten the flywheel, you take

material off the back, but sometimes you skim the front as well.  TR7 and TR8

have different pins and release bearing collars.  If you want pics and

measurements, I have both styles hanging around.  I can email them to you, but

they wonbt do you any good unless you have things apart.  Check to make sure

the spring is installed inside the slave cylinder and that it is in good

condition.  If the spring is missing or damaged, the return action of the

pedal is enough to pull the piston deeper into the bore of the cylinder, and

then the first few inches of pedal travel are used just to move the piston

back into contact with the rod.  The spring keeps the piston against the rod

at all times so no fluid transfer goes towards wasted movement of the piston.

Todd



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14
Wedge List / RE: TR7/8 Digest V1 #9070
« Last post by impster@maine.rr.com on April 20, 2019, 05:48:44 AM »
Date: Fri, 19 Apr 2019 14:49:07 -0400
From:
Subject:  Clutch issue?

I have been trying to bleed my new clutch hydraulic components and so far,
have had no luck.  I've let it gravity bleed, have pressure bled from the
master, elevated the front end, and even pulled a vacuum at the slave.  The
pedal feels like there is resistance (haven't driven the car in 8 yrs so
don't recall if it is the normal amount of resistance), yet I can't engage
the transmission.  I've also pulled the slave to confirm the push rod is
still engaged to the lever arm (or whatever the pivoting arm is called) and
found it secure.

Out of curiosity, I then measured how far the push rod was protruding out of
the bell housing and found it to be about 0.75 inch.  The piston in the
slave cylinder, when fulling extended, allows for 0.25 inch of the push rod
to extend beyond the bell housing.  Kind of hard to explain but the upshot
is that, at most, I have about a 0.5 inch range of motion on the push rod
before the clutch slave is fully extended in its bore.

Is 0.5 inch of motion at the outer end of the lever arm enough to engage the
clutch?  

Other info:  I inspected the lever arm when assembling and it did not appear
to be worn.  Woody built my engine and I'm thinking he may have lightened
the flywheel.  Is that material cut from the face? The clutch mechanicals
are used but only have maybe 5000 miles on them (Woody thought they looked
ok). I've also used a pry bar to press against the push rod sticking out of
the bell housing and with a bit of force, was able to move it so that it
felt like the clutch was being engaged. Everything worked ok before the
engine was rebuilt.

Or am I overthinking this and just not getting all the air out of the
system? I question that assumption because in my many decades of hydraulic
bleeding , I've never had a problem getting air out of the system.  Any
thoughts?
15
Wedge List / Re: Clutch issue?
« Last post by mark Elbers on April 20, 2019, 12:28:36 AM »
Both the pivot pin and the throw-out bearing carrier are different lengths

between the 7 & 8.











Sent from my iPad



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16
Wedge List / Re: Clutch issue?
« Last post by Robert Banathy on April 19, 2019, 11:54:12 PM »
Hi Darrell and Wayne,



There are two separate parts. I had to replace my TR8 tranny a few years

ago, and the installer used the part for the 7s. Lost clutch action

completely, remedied when the correct part was installed.

Best Regards,



Bob Banathy







*vos figere non stultus*
17
Wedge List / Re: Clutch issue?
« Last post by Darrell Walker on April 19, 2019, 11:48:08 PM »
I thought there were different lengths, but double-checking the parts manual I

only see one part number, so I guess I was wrong about that.



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18
Wedge List / Re: Clutch issue?
« Last post by Wayne Simpson on April 19, 2019, 11:27:17 PM »
In what sense is the pivot pin different, length?
19
Wedge List / Re: Wiper Washer Pump Xreference
« Last post by Mark Elbers on April 19, 2019, 08:36:29 PM »
I would expect pretty much any other LBC vehicle  with Lucas electrics of the

same period 1975-80 would be good bet.  Jags and MGBbs perhaps?



Sent from my mobile



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20
Wedge List / Wiper Washer Pump Xreference
« Last post by Triplesn8s on April 19, 2019, 05:33:31 PM »
Well, so much for getting lucky. Local NAPA store said they had one on the

shelf, I couldn't believe it. And should not have.  Drove across town, and

their system had directed the request to a universal pump.  Does the exact

unit cross reference to other period Models?



Bill

Sent from my iPhone

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