Dave pb Posted May 14, 2021 Report Share Posted May 14, 2021 Hello. I have a strap-drive propshaft at present. There has always been a lot of vibration, and much worse recently. I am planning to replace it with a sliding spine type from Dave Mac, after reading various old posts on this forum. So, a question:- is it just a straight swap or is the late 13/60 peculiar in some way? Rimmers shows shafts that are "not for late 13/60s". Cheers Dave Link to comment Share on other sites More sharing options...
Colin Lindsay Posted May 14, 2021 Report Share Posted May 14, 2021 You could always replace it with a solid type, no sliding joint to worry about. 1200 props are a straight fit. Link to comment Share on other sites More sharing options...
Casper Posted May 14, 2021 Report Share Posted May 14, 2021 John Kipping used to recommend ditching the straps and bolting the two parts together. C. Link to comment Share on other sites More sharing options...
trigolf Posted May 14, 2021 Report Share Posted May 14, 2021 4 hours ago, Colin Lindsay said: You could always replace it with a solid type, no sliding joint to worry about. 1200 props are a straight fit. Bin it and fit a solid one as Colin says. We had same vibration prob on our 13/60 and got a solid type from a 1200 in the local scrapper ( those were that days). Strap rhymes with crap for a reason! Gav. Link to comment Share on other sites More sharing options...
Clive Posted May 14, 2021 Report Share Posted May 14, 2021 6 hours ago, Casper said: John Kipping used to recommend ditching the straps and bolting the two parts together. C. Ah, thats where it comes from... I did just that for a chappie who had terrible vibration. Cured it in 10 mins (or less?) Just undid the bolts holding te straps, and rotated teh shaft 90degrees, bolted back up and hey presto, no vibration. Free, quick, nothing to lose. Link to comment Share on other sites More sharing options...
sulzerman Posted May 14, 2021 Report Share Posted May 14, 2021 I had a solid prop on my 1360 estate for years, never had a problem. Link to comment Share on other sites More sharing options...
Clive Posted May 15, 2021 Report Share Posted May 15, 2021 Sorry, I didn't answer the OP question. All herald props are the same length. And the late 13/60 is the same. I have no idea where some of these anomalies started? Anyway, if you have a new one made it is sensible to have a sliding joint. It will make fitting easier, and mean the UJs have an easier life. Dave Mac certainly knows his stuff... Link to comment Share on other sites More sharing options...
Dave pb Posted May 15, 2021 Author Report Share Posted May 15, 2021 Thank you all. I think I will invest in a new one. Not much else to spend money on at the moment, bring back holidays I say. Cheers Dave Link to comment Share on other sites More sharing options...
Dave pb Posted July 11, 2021 Author Report Share Posted July 11, 2021 I bought a spline propshaft from Dave Mac. Fitted it today. The old one dropped out nicely, and the new went straight in. A moment of panic when the stud holes at the diff end didn't line up, and I thought "the strap one has different holes!". Then a bit of calm took over, a 90 degree rotation and all was good. Test-drive showed all the vibration I had suffered for years has gone. Fabulous. But now I can hear all the other noises instead, which i need to track down. Thanks for all your advice. One original strap-drive now available............. Dave === Link to comment Share on other sites More sharing options...
Andrew Posted July 11, 2021 Report Share Posted July 11, 2021 Hi all I have a solid prop shaft on my 13/60 but I have always wondered why it works, surly you need a sliding part to take into account the suspension movement. Would love to know the answer Andrew Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 11, 2021 Report Share Posted July 11, 2021 there is no suspension movement at the diff , engine gearbox and diff are all mounted in the chassis so the prop doesnt need anything to allow travel there isnt any the strap drive props are not the best many fit a prop with a telescopic slide but that only takes up variances in assembly tolerances and they also tend to wear as they dont ever slide Pete Link to comment Share on other sites More sharing options...
daverclasper Posted July 11, 2021 Report Share Posted July 11, 2021 40 minutes ago, Pete Lewis said: many fit a prop with a telescopic slide but that only takes up variances in assembly tolerances and they also tend to wear as they dont ever slide Is the no sliding from lack of lube? Link to comment Share on other sites More sharing options...
PeteH Posted July 11, 2021 Report Share Posted July 11, 2021 Hi Surely, there is no need for slide on a small chassis, all the components are in the same plane?. Engine/Box and Axle are bolted to the chassis?. (with a few flexible mounts for good measure). You could (almost) do without ( prop shaft) U/J`s?. Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 11, 2021 Report Share Posted July 11, 2021 with engine shift under braking a fixed prop would exert a load on the diff pinion bearings and with chassis tolerances etc some amount of give needs to be built in and as the alignment of engine / gearbox to the diff is not a straight line a having no UJ would be ......terrible Pete Link to comment Share on other sites More sharing options...
PeteH Posted July 11, 2021 Report Share Posted July 11, 2021 Hi I think I used the Word Almost?. I certainly would not (personally) want such a rigid system. Especially after having been involved with aligning Marine Engines! and asociated Shafting!. Pete Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now