Capn Craig
Guru
- Joined
- Oct 16, 2010
- Messages
- 519
I am in the process of rebuilding the raw water pumps on my twin 200HP Perkins ST 6.354.4M's.* All was going well until the spider coupling hub on the pump shaft broke in half when I was removing it from the pump shaft.* While it could have been caused by me when I was tapping a screw driver in the gap to open it slightly to allow it to slide off the shaft, the markings indicate it was probably already cracked.* It cracked from one corner of the keyway slot and broke completely in half.* The broken coupling looks to be made out of cast iron, really looks like grey iron.* That hardly seems an appropriate material choice for something that has to flex slightly to remove and clamp.* Long story, short a new one from Perkins was quoted to me for $122.* And that is only*one side.* Worse, I can't get it to me before next weekend.* The coupling is a 3/4" ID bore with an ANSI std. keyway.* I can buy a generic spider coupling made of steel, not cast, same bore, keyway, overall length, with about a half inch smaller OD.* Rated at 25 HP at 2000 RPM.* The only real difference is that it is secured with a 5/16 set screw instead of the split hub/ 1/4' bolt like the Perkins.* Set screws work for prop shafts, I can't imagine why it wouldn't work here.* Best part, for $60. I get* both sides, plus Hytrel spider, I can have it on my door step at 10 AM tomorrow.*
Can anyone think of a reason this wouldn't be as good, if not better, and way cheaper.* I think I will try it regardless, but I appreciate your comments.
Can anyone think of a reason this wouldn't be as good, if not better, and way cheaper.* I think I will try it regardless, but I appreciate your comments.