Crankshaft pulley pin loose in crank
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
-
Topic author - Posts: 583
- Joined: Thu Jan 10, 2019 11:23 am
- First Name: Bruce
- Last Name: Compton
- * REQUIRED* Type and Year of Model Ts owned: 1921 Coupe, 1925 Coupe
- Location: Kemptville
Crankshaft pulley pin loose in crank
The pulley pin on my '26 is sloppy in the crank hole. The pin is not worn (0.375"). Is it safe, or even possible to drill out the hole in the crank and the pulley to the next standard bolt size ( 0.391), or is there another fix. The hole in the crank is already 0.386". Obviously I'm concerned about keeping a hand held drill running true through the existing hole. Thanks : Bruce
-
- Posts: 80
- Joined: Mon Jan 07, 2019 12:00 pm
- First Name: Peter
- Last Name: Claverie
- * REQUIRED* Type and Year of Model Ts owned: 1923 Touring
- Location: Memphis, TN
Re: Crankshaft pulley pin loose in crank
I'm reminded of a similar task I had on a non-T project. I used a tapered pin and a matching tapered reamer. I kept going until the pin fit where I wanted it to. In your case, I think you'd want to drill a cotter-pin hole in the pin, to keep it in place. The amount of taper on a pin is miniscule, and the pin is hardened steel.
The advantage here is that the reamer won't wallow around like a drill would do, and it would give you a nice round hole with plenty of contact surface with the pin.
I'm sorry to say I don't remember where I got the pin and reamer, but I was about 15 years old, and didn't have much money, so it was probably fairly cheap. You might be able to borrow a reamer from a machine shop -- I always recommend going to such a place in the Model T. When a machinist sees it, and gets to look under the hood, he'll probably open his stock to you, and be an eternal friendly supplier.
The advantage here is that the reamer won't wallow around like a drill would do, and it would give you a nice round hole with plenty of contact surface with the pin.
I'm sorry to say I don't remember where I got the pin and reamer, but I was about 15 years old, and didn't have much money, so it was probably fairly cheap. You might be able to borrow a reamer from a machine shop -- I always recommend going to such a place in the Model T. When a machinist sees it, and gets to look under the hood, he'll probably open his stock to you, and be an eternal friendly supplier.
-
- Posts: 1302
- Joined: Mon Jan 07, 2019 2:42 pm
- First Name: Frank
- Last Name: van Ekeren
- * REQUIRED* Type and Year of Model Ts owned: 1916 touring, 1916 pick-up, 1924 coupe, 1926 touring, 1927 touring
- Location: Rosedale Vic Australia
Re: Crankshaft pulley pin loose in crank
The crank can be drilled but if doing it in the car, make sure you can get to the hole from the other side as well so you can punch out the drill bits you are more than likely to break in trying.
-
- Posts: 5256
- Joined: Sun Jan 06, 2019 7:21 pm
- First Name: Allan
- Last Name: Bennett
- * REQUIRED* Type and Year of Model Ts owned: 1912 van, 1917 shooting brake, 1929 roadster buckboard, 1924 tourer, 1925 barn find buckboard, 1925 D &F wide body roadster, 1927LHD Tudor sedan.
- Location: Gawler, Australia
Re: Crankshaft pulley pin loose in crank
I'd much rather make an oversize pin to fit the hole you have than drill the crankshaft.
Allan from down under.
Allan from down under.
-
- Posts: 6496
- Joined: Fri Jan 04, 2019 9:37 pm
- First Name: Steve
- Last Name: Jelf
- * REQUIRED* Type and Year of Model Ts owned: 1923 touring and a few projects
- Location: Parkerfield, Kansas
- MTFCA Number: 16175
- MTFCI Number: 14758
- Board Member Since: 2007
- Contact:
Re: Crankshaft pulley pin loose in crank
I with Allan. I would rather make a pin to fit the hole than drill the hole to fit a bigger pin.
The inevitable often happens.
1915 Runabout
1923 Touring
1915 Runabout
1923 Touring
-
- Posts: 561
- Joined: Wed Jun 17, 2020 1:41 pm
- First Name: Kevin
- Last Name: Matthiesen
- * REQUIRED* Type and Year of Model Ts owned: 26 T Coupe, 16 T Open Express, 21 TT Flatbed. 15 T Roadster, 13 & 25 T Speedster , 51 Mercury 4 door sport sedan, 67 Mercury Cougar
- Location: Madera CA 93636
- MTFCA Number: 11598
Re: Crankshaft pulley pin loose in crank
From the numbers you give that is only .005 that you need to remove. It is mild steel, take a extra long piece, put it in your drill press, or ha.nd held drill and turn it slowly against a flat file, check size offen. Drill the split pin hole and pulley holes out and cut off to correct length. Check the new pin fit in hand crank rachit to make sure it won't stick
-
Topic author - Posts: 583
- Joined: Thu Jan 10, 2019 11:23 am
- First Name: Bruce
- Last Name: Compton
- * REQUIRED* Type and Year of Model Ts owned: 1921 Coupe, 1925 Coupe
- Location: Kemptville
Re: Crankshaft pulley pin loose in crank
I rechecked the hole in the crank and it was worn like a funnel on both outside sides of the crank but almost no wear in the middle. The smallest drill that would create a proper hole all the way through was a 0.084" so I made a new pin from a bolt turned down to 0.083" and drilled the crank and the pulley. Not a difficult job and all is well . Thanks for the input; Bruce
-
- Posts: 5256
- Joined: Sun Jan 06, 2019 7:21 pm
- First Name: Allan
- Last Name: Bennett
- * REQUIRED* Type and Year of Model Ts owned: 1912 van, 1917 shooting brake, 1929 roadster buckboard, 1924 tourer, 1925 barn find buckboard, 1925 D &F wide body roadster, 1927LHD Tudor sedan.
- Location: Gawler, Australia
Re: Crankshaft pulley pin loose in crank
Bruce, I hope your oversized pin is a neat fit in the holes in the pulley too. For the crankshaft hole to flog out as you describe, the pulley must have been moving on the crankshaft. A shim around the shaft may also be necessary.
Allan from down under.
Allan from down under.
-
- Posts: 1352
- Joined: Sun Jan 06, 2019 8:20 pm
- First Name: Robert
- Last Name: Jablonski
- * REQUIRED* Type and Year of Model Ts owned: 1926 Runabout
- Location: New Jersey
- MTFCA Number: 407
- MTFCA Life Member: YES
- Board Member Since: 1999
Re: Crankshaft pulley pin loose in crank
If you're only problem is the compensate for .005-in, I would take the pin over to the bench support each end of the pin give the center of the pin a few strikes with a hammer, install with the cotter pin. You'll find a pin not only will have to be tapped in but also will take up some of the looseness the pulley may have had....
-
Topic author - Posts: 583
- Joined: Thu Jan 10, 2019 11:23 am
- First Name: Bruce
- Last Name: Compton
- * REQUIRED* Type and Year of Model Ts owned: 1921 Coupe, 1925 Coupe
- Location: Kemptville
Re: Crankshaft pulley pin loose in crank
Thanks; The pin had to be lightly hammered into the pulley/crank and I'm pretty confident it will be fine. Thanks again : Bruce
-
- Posts: 2998
- Joined: Sun Jan 06, 2019 4:06 pm
- First Name: Jerry
- Last Name: Van
- Location: S.E. Michigan
- MTFCA Number: 24868
Re: Crankshaft pulley pin loose in crank
Does the hand crank ratchet still engage properly, without wanting to slip off the pin?
-
Topic author - Posts: 583
- Joined: Thu Jan 10, 2019 11:23 am
- First Name: Bruce
- Last Name: Compton
- * REQUIRED* Type and Year of Model Ts owned: 1921 Coupe, 1925 Coupe
- Location: Kemptville
Re: Crankshaft pulley pin loose in crank
Yes, the hand crank still works fine.
-
- Posts: 364
- Joined: Wed Jan 09, 2019 6:03 pm
- First Name: Stephen
- Last Name: Heatherly
- * REQUIRED* Type and Year of Model Ts owned: 26 coupe and 23 Runabout
- Location: St. Louis MO
Re: Crankshaft pulley pin loose in crank
I very slightly bent the pin in mine and it fit nice and tight afterwards. It's still good several years later.
Stephen
Stephen