Originally Posted By: The Critic
Originally Posted By: expat
Originally Posted By: TFB1
I've reused crush washer plugs dozens of times without issue, don't believe everything you read...
I thought the same thing.
For many years I never saw anyone replace the crush washers.
Never witnessed a problem.
The purpose of a crush washer in any application, is to provide a one-time sacrificial seal. Whether you have success in re-using the washer is irrelevant, as the washer was never intended to be re-used multiple times. Personal experience and correct procedure can sometimes be two different things, and one should not advocate for others to blatantly ignore the established rules.
Verbatim from 2008 Honda MC owner's manual:
6. Make sure the plug washer is in good condition.
7. With the plug washer attached, thread the spark plug in by hand to prevent cross-threading.
8. Tighten the spark plug:
-If the old plug is good:
1/8 turn after it seats.
-If installing a new plug, tighten it twice to prevent loosening:
a) First, tighten the plug:
NGK: 3/4 turn after it seats.
DENSO: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again: 1/8 turn after it seats.
I guess Honda didn't get the memo on not re-using the crush washers.
On a side note the old Champion catalogs used to sell bulk spark washers in case you wished to replace them.
By the way, the plug Honda is referring to is the DPR8Z, which does use a crush washer.