acmoc

ACMOC Membership Benefits

  • FREE quarterly magazine filled with content about antique Caterpillar machines
  • FREE classified listings
  • ACMOC store discounts and specials
  • Full Bulletin Board Access
    • Marketplace (For Sale/Wanted)
    • Technical Library
    • Post attachments

$44 /year ELECTRONIC

$60 /year USA

$77 /year International

D2 Pony Main Bearing Dowel Question

More
3 years 5 months ago #223025 by Cat Yellow1
While I had the pony apart checking the coolant passages, I double checked the front main dowel and found it not to be snug. I tapped it in lightly with a punch, also using red loctite. This evening, I checked it by pulling with a light grip with needle nose pliers and it came out without a lot of effort. It wasn't loose, mainly because of the loctite, but when I put it back in, it wouldn't go in snug like it should. What are my options? Would JB Weld work to properly secure the dowel in the block?

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago #223049 by Old Magnet
I never got around to trying it but I wonder if a roll pin would suffice.

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago #223053 by Alexjfrench
I am in the process of rebuilding mine and I just pulled the dowels the other day. When i did they were pretty tight. It appears that the factory put a small burr on the dowel to retain it in the bearing. It was kind of loose in its seated position but as I pulled it up the burr engaged with the block it got tighter and tighter. It got to the point where I had to use a slide hammer and a tiny socket head cap screw to get it out. In all I would say it was not a very good design. When I go to reinstall mine I am going to re drill the passage and then ream it. Then I will make a dowel to match the hole with some Loctite. There is a video on YouTube by LineshaftRestorations that outlines the whole procedure. I would love to know how others have done theirs. I think if you could get in there with a punch and peen the bottom of the dowel over or mushroom it a little I dont think it would go anywhere. I guess I will just have to wait until Squatch gets to that point in his build on YouTube. Please let us know what you come up with.

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago #223056 by Cat Yellow1
Thanks OM. Something worth thinking about. I might give that a try if my other options don't work. It is a new dowel but I ordered another one which should be here this week. The dowel is loose in the block. It appears that someone in the past may have drilled it out. I'll see if the new one is any tighter, if not maybe I'll try deforming it slightly into an oblong shape to see if that will help it grip better.

Does the JB Weld sound like a bad idea?

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago #223058 by ag-mike
I locktited 1 i was having problems with. I think i used a tiny amount of jb front and rear to capture it too. Make sure the oil dish can still direct oil into the pin to lube the bearing.

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago - 3 years 5 months ago #223067 by kittyman1
it amazes me how little it takes to keep a bearing in position...assuming everything is correct...round journals, round rods so there is bearing crush when shell is inserted into block or rod...most automotive only has a tiny tang so they can't spin....and sometimes a bevel on the edge(s) so not to grab journal etc....

always dropping GOLD, all you have to do is just pick it UP !
Last edit: 3 years 5 months ago by kittyman1. Reason: grammar

Please Log in or Create an account to join the conversation.

More
3 years 5 months ago #223088 by Cat Yellow1
I took a chisel and deformed the top of the dowel slightly to give it a bit of an oval shape. Not very noticeable but enough to require a center punch to set it and it fits snugly. Thanks everyone for your input.

Please Log in or Create an account to join the conversation.

More
3 years 4 months ago #223384 by trainzkid88

I never got around to trying it but I wonder if a roll pin would suffice.


probably if you got one just the right size.

roll pins are designed to have a smaller roll pin driven in to the centre of the larger pin to expand them and lock them in place. there are also special rounded tip pin punches for driving them

a old farmer told me a tip about these pilot start cats he said to make a couple of timber wedges to support the flywheel of the pilot when its not running and prevent it from pounding out the main bearings and eventually the castings due to the vibration and oscillation of the machine while its running

Please Log in or Create an account to join the conversation.

Time to create page: 0.163 seconds
Go to top