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Author Topic:   Mercury Manual gripe
Sailor Rob posted 10-03-2006 08:09 AM ET (US)   Profile for Sailor Rob  
Does anyone know the size of the oil drain plug on the 90HP Mercuries? Mine is an '05 and I've tried 11/16, 17mm (too small) and 3/4, 19mm (too large).

I paid $80 for the manual and under specifications for bolt head sizes it lists oil drain plug - "N/A" !!!

I bought the hand oil pump listed in the manual under "special tools" but when I tried to use it I discovered that a special dipstick is also required but is not listed under "special tools".

Is this a bad omen for reliability of this manual?

Mel Wallace posted 10-03-2006 03:06 PM ET (US)     Profile for Mel Wallace  Send Email to Mel Wallace     
Well, it sounds like an 18mm.
Chuck Tribolet posted 10-03-2006 04:19 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Yep, does sound like 18mm. So far he's tried:

17 mm
17.4625 mm (11/16)
19 mm
19.050 mm (3/4)

There does seem to be a hole in the sizes there. And that's
a Yamaha powerhead, right? Guaranteed to be metric.

BTW, have you noticed how some manufacturers use some
of the metric sizes, and others use others. Fer instance,
Nissan uses 10, 12, 14, 17, 19 mm, and never 11, 13, 15, 16,
18 mm, but other manufactureres (VW, I think) use the others.


Barney posted 10-03-2006 08:02 PM ET (US)     Profile for Barney  Send Email to Barney     
Sailor, My 90 4 stroke manual has been pretty good, same as yours I think. Much better than nothing I guess. Some procedures are left out, but manuals are expensive and these are at the low end of the spectrum of price. Your outboard is a mixture of Yamaha powerhead and Mercury lower end. Many of the diagrams are Yamaha converted to Mercury. Some items maybe Mercury didn't know at the time of publishing the manual. If you don't have a 10 micron fuel filter on that outboard get it. Yamaha took that direction later and Merc didn't. Problems could arise with the fuel system.

Oh yeah, as Mel and Chuck have said 18mm is it. Spot on. Jim

Sailor Rob posted 10-03-2006 08:30 PM ET (US)     Profile for Sailor Rob    
You guys are great! I did a google search and found an obscure reference that said 18mm. So I'm off to buy an 18mm socket for the oil drain plug and a 10 micron filter for the gas.

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