| Author | Message | ||
     Randy Roberson Prolific User Username: wascator Post Number: 211 Registered: 5-2009 |
OK, who can settle this question: which way does the wave spring under the inlet valve disk go? The Factory manual, including the illustrations, is not clear. | ||
| gordon le feuvre Experienced User Username: triumph Post Number: 29 Registered: 7-2012 |
I cannot remember that it actually matters. I have overhauled loads of pumps from the earliest shadows and have always put them back in with the outer edges facing up. Worked for me! | ||
| David Gore Moderator Username: david_gore Post Number: 1377 Registered: 4-2003 |
Gordon, The valve disk must be open during the suction stroke to prime the pump and closed on the delivery stroke so the fluid is pressurised for discharge. Too many years have passed since I overhauled a hydraulic pump for me to remember the orientation. You can quickly bench test an assembled pump by clamping the pump in a vice, filling the inlet port with a suitable fluid [I used methylated spirits] then using a rod to push the piston whilst blocking the discharge port with a finger. If the pump is correctly assembled, you will feel a distinct rise in pressure; if not, no pressure will be felt. | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 3013 Registered: 4-2003 |
I'm fairly sure that it makes no difference, but it looks sweeter with the outer edges facing upwards. By the way, brand new pumps are not expensive these days. A new pump from the box saves a lot of bother. RT. | ||
| Randy Roberson Prolific User Username: wascator Post Number: 212 Registered: 5-2009 |
Thanks, everyone. To me, "...a lot of bother" is sort of the point. That's where most of the fun is! | ||
| Omar M. Shams Grand Master Username: omar Post Number: 391 Registered: 4-2009 |
Dear Richard, I am keen to know more about new pumps. How much is cheap and where do you buy them from? I must admit it never occured to me to consider buying new pumps. Is this for both types of fluid too? Thanks Omar | ||
| Richard Treacy Grand Master Username: richard_treacy Post Number: 3014 Registered: 4-2003 |
Hallo Omar, I mentioned inexpensive which is very subjective. If you value your time it is a bargain, but if you like to spend hours as a hobby it may be marginal it but still makes sense to buy new. A new pump will fit directly and carry a warranty, whereas you are on your own with a rebuilt or dodgy exchange pump. Any exchange component is risky as it was replaced for a reason unknown but very real. You can even buy a reconditioned exchange pump for two thirds the price, but good luck and wear shipping costs for the return and a surcharge if the old pump is even slightly damaged. The really good news is that brake pumps are now available for the foreseeable future, whereas a year ago there were only unhealthy rebuilt ones available at a higher price. All three types of brake pump are available new. For example, SpurParts retail them for less than A$700 list. That is around the price of repairing a pump with new springs, valves, seals and so on. The three types are UE35319 for early SYs, UE40534HB for late SYs and RH14073GMF for SZs. RT. | ||
| Omar M. Shams Grand Master Username: omar Post Number: 392 Registered: 4-2009 |
Many thanks for that eye opener Richard. |
