wullie3XV9
Wullie3XV9
Group: Members
Posts: 293
Joined: June 2008 |
 |
Posted: Jan. 27 2009,23:10 |
 |
I spent today getting rid of most of the lateral end-float on both of my Power-Valve spools, which causes the notorious "death rattle" sound from the engine area. If someone has posted this method before, my appoligies, I've obviously missed the "thread" that it first appeared on !! I thought of this all by myself, honest !! 
If you own, ( or can beg or borrow, I'm not condoning stealing !! ), a small file, it's a cost free cure for "death rattle".
Before I did this, both my spools lateral end-float was around 0.7 - 0.8 mm !!
Remove P.V. caps & spool before filing starts on cap mounting lugs. (Lugs high-lighted above by orange pointer).
Using the small file, remove small, equal amounts of metal from
both lugs, on both sides of each cylinder. Aim for 0.2 - 0.3 mm of spool end-float. The moral here is, remove a little, trial fit often !!
With the spool & caps refitted, ( including rubber cap seal ), & fasteners tightened down fully with an Allen key, check the end-float & that the spool turns easily in its housing.
If you feel there's still too much end-float, remove caps & spool, & file a little more metal off the lugs on BOTH sides. Try to centralise the curveture of the valve in the curved part of its housing, visible at the top edge of the exhaust port, which will help reduce friction when being turned. I removed approx. 0.2 - 0.25 mm from the lugs on each side of the cylinder, ( 0.4 - 0.5 mm in total ).
REMEMBER, LITTLE AMOUNTS, CHECK OFTEN !!
As stated earlier, aim for 0.2 - 0.3 mm. This amount of end-float SHOULD allow for any expansion of the Power-Valve spool when hot. I'll find out if this has cured my "death rattle", ( & if the spool still turns freely !! ), when I get my engine back together & running !!
As I said at the start, a free & easy cure !! ( hopefully ) 
Again, my apoligies if someone has suggested all this before on a previous thread !! 
--------------
Just when I'm about to make ends meet, someone moves the ends !!
|
. New outer oil seals will also quiten 'em down... for a bit. 
( I used a 0.5 mm thick shim. I couldn't find anything thinner ). Filing the cap lugs down was Plan B. I've got new seals waiting to be fitted during the engine rebuild. 
