• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

TR2/3/3A Extension Crank Bolt Attachment

Redoakboo

Jedi Warrior
Country flag
Offline
I am finishing up the reassembly of my rebuilt TR-2 engine. I have just installed the crank collar/pulley & fan. I am now installing the long bolt that the crank handle fits into. I can't find the torque setting for this bolt, not in the TR manual; I can't find it?

Dick
 

TR3driver

Great Pumpkin - R.I.P
Offline
I don't believe there is one in the manuals. It's not critical; anything in the 120-150 ftlb range should do fine.
 

Geo Hahn

Yoda
Country flag
Offline
If you plan to use the hand-crank to start the car (requires you retain the hole in the radiator) then there is a recommended orientation for that dog on the front of the bolt. Without looking I am thinking it is 4:00 / 10:00 for the flats of the 'teeth' when at #1 TDC.

To get that and about the right torque shims may be used.
 
OP
R

Redoakboo

Jedi Warrior
Country flag
Offline
Randall.

When it gets up to about 40# it seems to start slipping? I took the collar off to make sure the woodruff key had not come out of the slot, it hadn't? Should the collar be touching the crank sprocket? I have about a 1/4" gap between the collar and the sprocket. Tried to force further with a hammer, no dice? All the threads look good.

Dick
 

TR3driver

Great Pumpkin - R.I.P
Offline
Yes, the dog bolt should clamp the whole mess together solidly: fan extension, pulley hub, oil slinger, timing chain sprocket, and any shims behind the sprocket should all get clamped tightly against the front cheek of the crankshaft. And a snug fit on the crankshaft is good. Sounds like you are OK.
 
OP
R

Redoakboo

Jedi Warrior
Country flag
Offline
But, why can I not torque the dog bolt any tighter then about40#? When I have the whole assembly, fan extension, pulley hub, oil slinger, timing chain sprocket, and a couple of shims as tight as I can get them on with a hammer, I still have about 1/4" gap between the pulley hub and the sprocket, not a particular snug fit? When the torque wrench only reaches about 40#, tightening the dog bolt, before it starts to slip. To keep the crank from turning, while I'm tightening the bolt, I have a square bar between the rear bolts of the rear crank hub.,flywheel not installed yet.

I just don't want to take a risk of slinging that bolt out when I finally get the engine running again.

Thanks for your help, Randall

Dick

Dick
 

TR3driver

Great Pumpkin - R.I.P
Offline
I think your "slip" is the pulley hub continuing to move towards the sprocket, as it should. The hub is evidently tight enough on the shaft that your hammering (not a particularly good idea, BTW) did not move it into place.

Try letting it "slip" for a turn or two, and check again. I think you'll find that the hub moved towards the crankshaft (by about 1/9" for two turns). Of course, if you're doing this without the timing cover (so you can see that gap), then you'll probably have to use a puller to get it back off again. Might be best to put the timing cover on first.

I doubt it would "sling the bolt out"; but every time the engine fires, it puts a torque pulse into all those parts. If they can move at all, they will work back and forth (even with the key in place) and eventually get ruined. I made a mistake once when eliminating the fan extension (to make room for the electric fan), and it eventually waddled the keyway out to about 1/2" wide! Both keys were in bad shape, but still in place.

Made the funniest noise, too. At idle, sounded like someone was ringing a bell inside the engine.
 
OP
R

Redoakboo

Jedi Warrior
Country flag
Offline
I just thought of something, in my dream last night! You know that dreams are great at reminding you what you forgot to do? I have installed one of the new yellow fans, backwards, so I won't have to buy an expensive new spindle, so says Albert at Roadster Fact. I think if I remove the fan and then try to tighten the bolt it might just work. It appears the fans goes over the bolt anyway, encase you ever had to replace the fan, you would not have to remove the "subject" bolt?.

The timing cover is on, but I still have a good view of the gap between the collar and the sprocket.

Will try your suggestion today, thanks again for your help; wished you lived in Clermont Fl. !

Dick
 

TR3driver

Great Pumpkin - R.I.P
Offline
Right, tighten the bolt before installing the fan. The stock fan mount even includes a keeper that fits over the hex and keeps the bolt from turning.

I don't understand your comment about being able to see the gap ... The sprocket isn't even visible through the hole before adding the hub. The oil slinger goes between the cover and sprocket, and is larger than the hole, so all you could see is the oil slinger. And IIRC the hub goes into the seal by more than 1/4". So if it is within 1/4", it would already be touching the seal.

But I don't suppose it matters, as long as you understand.
 
OP
R

Redoakboo

Jedi Warrior
Country flag
Offline
Thanks agin!! Randall.

I removed the fan, installed a new shim, they sure get trashed when you tighten the bolt. Was now able to tighten to 120#, that's as high as my torque wrench will go. You are right as the gap I was addressing was between the edge of the collar right at the timing cover.

Why does R.F. recommend installing the yellow fan backwards, unless you buy one of the special spindles. I assume it would put it to close to the radiator?

Dick
 

TR3driver

Great Pumpkin - R.I.P
Offline
I believe that is the issue, the fan sticks out too far. But I have no experience with that mod; prefer my electric fan setup :smile:
 
OP
R

Redoakboo

Jedi Warrior
Country flag
Offline
I have an electric fan on my TR-3, and a holeless aluminum radiator, keeps it cool.

I couldn't salvage the TR-2's radiator, sitting for 30 years rotted out the whole bottom. It was twice the amount to recore it then buying another aluminum radiator, like the one in my TR-3.
 

DavidApp

Yoda
Country flag
Offline
As far as I remember the Yellow plastic fan will hit the cross tube between the suspension towers if it is not reversed. I had to reverse mine when I fitted that tube.
There is just room to get the fan belt on but you have to feed it past the fan blades.

How did the shims get trashed?

David

Thanks agin!! Randall.

I removed the fan, installed a new shim, they sure get trashed when you tighten the bolt. Was now able to tighten to 120#, that's as high as my torque wrench will go. You are right as the gap I was addressing was between the edge of the collar right at the timing cover.

Why does R.F. recommend installing the yellow fan backwards, unless you buy one of the special spindles. I assume it would put it to close to the radiator?

Dick
 
Similar threads
Thread starter Title Forum Replies Date
Alfred E. Neuman TR4/4A TR4 fan extension and crank bolt length Triumph 9
GTP1960 TR2/3/3A Removing the fan extension from the Crank hub Triumph 13
71TR6 TR2/3/3A Aftermarket brake and clutch master cylinders - black extension? Triumph 6
F TR4/4A Seat rail extension Triumph 4
T Tail light extension Spridgets 2
WHT Remote Clutch Slave Cylinder Bleed Extension Austin Healey 11
DrEntropy MGB Pedal extension MG 6
BobHaskell For Sale Clutch Slave Cylinder Bleeder Extension Austin Healey Classifieds 13
tahoe healey DIY Extension for Clutch Bleeding Austin Healey 23
B TR4/4A Can't get rear extension off. Help! Triumph 24
D clutch bleeder extension Austin Healey 20
pkmh "Bearing Outer Race" Re-installation at Passenger Front Hub Extension Austin Healey 4
G TR4/4A TR2-3B Hub Extension Triumph 6
S TR2/3/3A Fan Extension Removal Triumph 16
mgedit TR2/3/3A Removal of Fan Extension and Pulley Triumph 20
GTP1960 TR2/3/3A Hub extension torques? [for wire wheel] Triumph 4
Willie_P TR4/4A Fan Hub Extension removal early tr4 HELP Triumph 9
M TR2/3/3A Tail pipe finisher [extension] Triumph 13
M TR2/3/3A "60" TR-3A - fan extension Triumph 8
AHS TR2/3/3A Fan extension length for TR3? Triumph 7
B Rear Hub Extension Studs Austin Healey 22
Rob Glasgow Worn Hub Extension Studs Austin Healey 2
Lin Rear Hub Extension Nuts: Attention Rich Berman Austin Healey 23
7 lubrication for gear extension Triumph 5
richberman torque for hub extension nuts? Austin Healey 3
Bremer TR2/3/3A TR3/4 fan hub extension elimination kit? Triumph 3
K TR2/3/3A TR3A Splined hub extension picture? Triumph 4
sjuengst Hub extension retaining nuts Austin Healey 10
bighealeysource Fit of extension panel to gearbox cover & bulkhead Austin Healey 6
M_Pied_Lourd TR2/3/3A TR3A Fan Extension End Bolt Size Triumph 20
C TR2/3/3A fan pully extension for a tr-3 1957 Triumph 4
T TR4/4A TR4 Fan Extension Dog Bolt Torque Triumph 4
J TR4/4A TR4 Fan Hub Extension replacement Triumph 4
tony barnhill Rear Hub to Wire Wheel Extension Question Spridgets 3
Tinkerman TR2/3/3A Fan to Fan Hub Extension Torque Data TR-3 Triumph 5
ronzet MGA MGA Chassis Extension MG 4
martx-5 TR2/3/3A Extension Piece On TR3 Bump Stop Triumph 12
T TR4/4A TR4 Engine - Fan Hub Extension Triumph 4
B TR6 71 block & crank Triumph 1
J Wanted WTB Bell Crank Pivot Triumph Classifieds 2
K TR2/3/3A What is the best way to prevent the crank from turning ........ Triumph 27
Michael Oritt Rear Crank Seal Kit Austin Healey 7
M Wanted Dampener Tr4a crank pulley Triumph Classifieds 9
T MG Midget 1500 crank shaft pulley Spridgets 0
S TR2/3/3A Tightening the crank pulley dog bolt on a tr3 Triumph 7
nichola TR6 Door handle and window crank installation Triumph 0
D TR2/3/3A TR3 throttle linkage bell crank. Triumph 13
R Wanted 3 main crank MG Classifieds 1
Twit early TR4 Crank Handle wanted Triumph Classifieds 0
P TR6 Tight window crank Triumph 9

Similar threads

Top