I saw a comment I think in this NG about finding replacement B & S
engines - the one on my cylinder lawn mower has lost compression and I
can't find why despite stripping most of it down and the solution seems
to be to find a replacement. The question is where to go to ?
Generally its the valves needing regrinding.
IIRC new pistons and liners can also be obtained.
A whole new engine is usually when you have bent the crank and split the
Any B & S stockist can get you parts,or a new engine.
As NP said its normally only the valves that need attention
New engines, but ridiculously expensive
best place is your local tip, as most cylinder mowers usually end up there
with a working engine.
Probably cheaper to go to one of the sheds and buy a whole new mower than
getting a new engine from your local B&S dealer. If you existing body etc
is good buy a really cheapy mower just for the engine and dump all the
new body bits. Though if your careful with choice many parts could be
used as spares...
Dave. pam is missing e-mail
Thanks for all your replies and the ideas, guys; can't be sure but sure
but someone somewhere talked about some sort of dump near him where old
mowers etc ended up and I wondered what sort of dump - no doubt if I
did find such a place locally I wouldn't be allowed to do the logical
thing of recycling, but it's probably worth some beer tokens to get the
guy to switch his eyes somewhere else for 5 minutes.
I'll try searching the archives of the NG's I use.
It's fairly easy to find out why the compression is low especially if
you've already had a look and found nothing obviously wrong like a hole in
the piston. ;-)
Add a couple of teaspoons of engine oil via the sparkplug hole. If the
compression returns, it's likely ring wear or even broken ones. If no
difference, likely the valves. With the head removed, fill the ports with
paraffin. A faulty valve will allow this to run past it. Most likely valve
to fail is the exhaust one. Remove them both and examine valves and seats.
No obvious damage means they can be lapped in by hand. If the seat is
damaged a decent car etc engineering workshop will re-cut it for you. The
valve may also be refaced or simply replaced if damaged.
*Oh, what a tangled website we weave when first we practice *
Dave Plowman email@example.com London SW
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