Eric, I would not personally worry about your end float, sounds like you
have it set fine. As for the Lock washers, I would defineately NOT use lock
washers. I would however, very highly recommend you find some thick high
strength washers and place them on top of the caps. Your local machine shop
will have some good ones on hand. I have found that the Main caps on
Triumphs tend to 'cone' out at the top from the bolts slowly deforming and
being pulled through, this tends to crack them - something like shoving a
wedge through something. I would also make sure that the top part of the
main cap (where the bolt head and your new washer will sit, is flat - if not
have it machined.
This issue, while not being critical to the point of measurement, is
important to durability.
Patrick Bowen
-----Original Message-----
From: Eric Conrad [mailto:econrad@teal.csn.net]
Sent: Saturday, December 02, 2000 4:35 AM
To: 'Triumphs'
Cc: Larry Morrison; Inc. Power British Performance Parts; Chris
Kantarjiev; Wayne Whippo; levilevi@home.com; Randall Young; Fred Thomas;
Randall Young
Subject: TR6 engine reassembly - Crankshaft endfloat - help
After all the banter about 'non-triumph' stuff, and with many people
scrambling to "unsubscribe", I'm hoping I'm not just sending this into the
proverbial "concert hall", with only the crickets to hear my question. I
really do need some advice.
I'm reassembling my engine. Prior to disassembly (several months ago), the
end float was terrible. I seem to remember it being between 0.015" and
0.020" prior to machining the engine and crank. Tonight, after I replaced
the mains and added STD thrust washers, I checked the crank end play -
wanting to do this before I go any further.
Both my Bentley and Haynes manuals say that the acceptable range for the end
float should be 0.006" and 0.008". These figures are primarily mentioned
for checking the end float for a run-in engine, while the engine is still in
the car. I'm assuming that my rebuild should also be within the same
tolerances, as no other data is provided for a fresh engine's end float. As
I measured my end float several times, I constantly got a reading of
0.0075". Is this too close to the upper tolerance limit that I should add
one 5-thousanths oversized thrust washer along with keeping one standard
thrust washer in place? (I understand that 5-thousanths is the smallest
oversized thrust washers.) If I should add the oversized thrust washer, I'm
figuring my end float would be approximately 0.0025". Is this too little
movement?
In a related question, does anyone have thoughts about control rod
positioning, as affected by the thrust washers? In other words, is it
possible to have the conrod journals either too far forward, or too far
rearward, and still be within the specifications of 0.006" and 0.008"? This
will be my concern if I do have to add a 5-thousanths oversized thrust
washers.
I guess lastly, I'm following the manual instruction for bolting the main
caps, and including lock washers to keep the bolts from backing out. I've
also added BLUE loc-tite. It seems to me that I've read a thread on this
list lately that stated that lock washers should not be used, and that
loc-tite is sufficient to hold the bolts. Any thoughts before I get too
far?
Thanks all,
Eric Conrad
'76 TR6 - engine rebuild began tonight, and went late into the morning -
non-stop! Ugh!
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