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Joined: Apr 2009
Posts: 1,966
ChatMaster - 1,500
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OP
ChatMaster - 1,500
Joined: Apr 2009
Posts: 1,966 |
What size cotter pin was used on original connecting rod castle nuts for '30 engine. I see hole in bolt is 1/8" dia, my car had been previously worked on in this area and had 3/32" cotter pins. I have some 1/8" and 3/32" pins. The 3/32" seem a bit sloppy fit, but whan locked into place I suppose would stop nuts from backing off. The 1/8" is tighter fit, but very difficult to install as the 1/8" nut slots and bolt hole must line up perfectly in order to do so. Anyone know what is best option? Planned initially to use 1/8" pins but now thinking of going back to 3/32". As far as I can see, 29-32 parts manual is silent on this.
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Joined: Apr 2010
Posts: 734 Likes: 14
Oil Can Mechanic
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Oil Can Mechanic
Joined: Apr 2010
Posts: 734 Likes: 14 |
Hello Gunsmoke,
1/8" cotter pin holes in the connecting rod studs and 1/8" castle nut slots should take a 1/8" diameter cotter pin. No need to skimp after all your efforts. I would think that the torque numbers associated with these size fasteners would be in the middle of a range. Maybe a small range, but I think you should have no issues increasing or decreasing the torque to align the cotter pin slots. Loose cotter pins may negate a torqued fastener over time. I'll take slop playing pool, but not with the guts of the engine. My Humble Opinion.
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Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
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ChatMaster - 7,000
Joined: Nov 2002
Posts: 7,472 Likes: 26 |
I agree with Harrys31 coach. The less slop the better. I find it very frustrating when purchasing nut and bolt etc. hardware to find that most is purchased offshore and is only close to the spec advertised. As an example buying 1/4 inch washers that will fit over a 5/16 bolt.
Steve D
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Joined: Apr 2009
Posts: 1,966
ChatMaster - 1,500
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OP
ChatMaster - 1,500
Joined: Apr 2009
Posts: 1,966 |
OK, I guess I'll try to get the 1/8" pins in place.
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