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 Spark plugs

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T O P I C    R E V I E W
Sal Garfi Posted - 28 Feb 2017 : 09:43:26
Hello All,

I have a simple question. My Norman has a Mariner 15 four stroke outboard and I don't have the right size spanner for the spark plugs. They are labelled as DPR6EA (with the number 9 underneath), so, are they a standard size (as on a car) or slightly smaller? Anyway, are spark plugs in general a standard size? To be honest, I have never put my mind to it.

Thanks.

Sal
5   L A T E S T    R E P L I E S    (Newest First)
jud Posted - 04 Mar 2017 : 11:36:59
[quote]Originally posted by IanM

I'm sure I have at least three different sizes of spark plug socket. The one I want is always the third one I try.
/quote]
The one I want is normally the one in the box I've not bought with me.
Sal Garfi Posted - 01 Mar 2017 : 10:32:09
I think that 16 mm might be right. As i said, the plugs, from the outside, look smaller than the car plugs I'm used to (I'm still living in the 1960-70s. Thanks

quote:
Originally posted by df

I think they are 16mm (5/8") across the flats on those sort of plugs, probably 10mm or 12mm threads, old school car engines were generally 18mm threads using 13/16" sockets, modern cars tend to use the smaller sizes as do modern bikes.

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Sal
trevork Posted - 28 Feb 2017 : 15:35:11
Ahhh well Ian, you will know which one to use next time then Ian! The third one you were going to try!
IanM Posted - 28 Feb 2017 : 13:20:46
I'm sure I have at least three different sizes of spark plug socket. The one I want is always the third one I try.
df Posted - 28 Feb 2017 : 12:56:38
I think they are 16mm (5/8") across the flats on those sort of plugs, probably 10mm or 12mm threads, old school car engines were generally 18mm threads using 13/16" sockets, modern cars tend to use the smaller sizes as do modern bikes.

NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk

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