[ROVERNET - UK] P5 booster problem solved

peter king peter at king-co.com
Sun Nov 5 22:33:17 GMT 2006

Hi Kent.

I used the "special" black grease that came with the rebuild kit. The  
two tubes weren't labeled, and at first I thought it was gasket  
sealer. It had the same consistency, but it actually felt like there  
was a fine grit in it. The instructions that came with the kit said  
nothing about the lubricant, but the manual mentioned using the other  
"red rubber grease" on the piston shaft, so I used the other black  
grease for the leather.

I used metal polish on the inside, and I greased the sides of the  
canister lightly, as well as the leather. It definitely made a  
difference in the return. I also removed the "t" valve and piston and  
made sure there was nothing obstructing it's operation. I cleaned out  
the housing again, flushing it with clean fluid into a black plastic  
container, which revealed a lot of tiny aluminum specs that had  
remained in the cylinders. I don't know if the flecks were causing  
any trouble, but they would have, over time, no doubt. Anyway, after  
I did that,  I felt better about the piston movement and the "t"  
valve's function.

The other thing I noticed was that I was able to remove the piston  
plug the first time by rapping the unit on a wooden surface, as the  
manual says, but the second time, with the new seal in place, I had  
to use the method given in the kit's instructions, pushing the piston  
out from inside. I used a modified small allen wrench, bent down at a  
slight angle, which was stiff enough and gave me enough leverage to  
push against the plug enough to get it out. It took a lot of repeated  
lever actions to get the plug out.

Good luck with yours!


On Nov 4, 2006, at 8:12 PM, Kent Kinard wrote:

> On Sat, 4 Nov 2006 19:51:12 -0500
>  peter king <peter at king-co.com> wrote:
>> Many thanks to all who responded to my inquiry re: p5 booster
>> i removed it at re-cleaned it and polished the inside of the  
>> vacuum  chamber, re-greased and re-assembled and all is well. I  
>> suspect it  was resistance in the vacuum chamber, after all.
>> So thanks for all the advice.
>> Peter
> Hi Peter,
> I celebrated too soon.  I started having the same problem, so its  
> good to know which end to start at.  What did you use to re-grease  
> the leather?
> I've run out of grease.
> Roverly,
> Kent K.
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