I need some recommendations for a good, heavy duty valve spring compressor. So far I've stripped the threads out of one(Triumph Wholesaler) and bent (Pit Posse)the other. These are not stock Triumph springs I'm using either. I'm guess maybe I'll have to take the time and fabricate one myself. What's everyone else using? Thanks! Alan
I'm using a large C-clamp with a piece of chrome-moly tubing (cut in half) and a large washer welded to the fixed end. The washer fits over the valve stem and collets, and you access the collets via the open side of the tubing. Sorry, no picture, but I can supply dimensions if you like. I've used it on Triumph heads as well as my A65s; it works well.
I have been using one of the cheap compressors off eBay for the last two years or so. Works like a dream every time, Moto Guzzi, Triumph, Norton, Sunbeam, even on my DR650. The secret, put some pressure on then give the valve stem end of the compressor a tap with a soft hammer and the collets unseat then wind the retainer down enough for removal.
If you do not do that the body will start to bend or distort.
The taper fit of the top collar and 2 keepers is the reason for your frustration.
Tapers lock together and can take an inordinate amount of force to get them to release. This is why they are used on clutch and flywheel shafts. To use a valve spring compressor you must first release the lock that is holding the keepers tight in the top collar.
To release a taper lock does not take a lot of pressure, but a sharp shock from the likes of a hammer. This is what you do when you use a clutch hub puller when you tighten it and then hit the head of the bolt with a hammer. The tension of the puller and then the shock delivered by the hammer blow releases the taper. While this can be done using the valve spring tool: put a bit of tension on the spring-collar assembly and then hit the head of the compressor with a hammer, most technicians use a 3/4" spark plug socket open end seated on top of the collar and with a medium sized hammer give the drive end of the socket a rap and then use the spring compressor to remove the collar and collets.
While Excalibur's spring tool looks minimal it is more than up to the job if the lock provided by the collar/keeper taper is released before it is used.
I modified the one that was bending and this works fine. Thank you John Healy, the key is shocking the collars first! Craig, I'm using ROTAX valve springs "naked" (no cups)in a 500 Daytona head. Thank you everyone for your replies!
This is the Hot set up on the 500 Brakeless race motor. This is how Johnson Cams sets them up. Yes they do heads as well, not just cams. They do a lot of head and cam work for the Pro GNC Flat Trackers. Not sure of the load, I'd have to call them to find out.
Craig, The term Brakeless is a class in flat track racing where none of the bikes have brakes. I believe brakes became mandatory in 1969 or 1970, not certain. Also, the Harley KR's (side valve) and the Triumph 500's (overhead valve)were the most common bikes in this class. My own opinion this class is the most fun to race.