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Old 07 October 2010, 08:02   #1
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Clamshell poppet valve?

I'm reassembling the lump, and I have found a rather bizarre thing - my poppet valve doesn't have anything to seat against.

So, I go & look at the parts listings to see what is missing, and discover that on the 3 cyl 60s there doesn't appear to be one at all, (likewise no thermostat) but they show up on the 650. (implying my engine is definetly not the age that the casing would imply.....)

So, the question:

Was that valve deleted for newer versions of the clamshell? If not, (and this is probably one for Uncle Al or Outboardtech) was the spring rate (strength) changed to prevent failures?


....and if it was deleted (as implied by the microfiches), can I just not install either & let the water flow free?
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Old 07 October 2010, 11:36   #2
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Country: UK - England
Town: bicester
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yep your correct a 650 parts required is,
1X 65848 carrier in stock at barrus
1X 25-64872 grommet in stock belguim
if you want a picture send me an e-mail address and i will do in monday
uncle al
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Old 07 October 2010, 12:19   #3
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Country: UK - Scotland
Boat name: Wildheart
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Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
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Al, thanks.

Implication of this is I have a far older powerhead than engine cover!


Having looked through parts lists, I notice there may be 2 springs in the mix. It is the spring that now concerns me, in case it had been altered to be softer or harder. I don't want to cook my engine for the sake of a spring, and so will just replace it

Don't suppose I could be really cheeky & ask what the part number of the newest spring is?
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Old 08 October 2010, 04:42   #4
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cant stand cheeky kids, i will let you know on monday cos i dont work fridays anymore cos im old
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Old 11 October 2010, 04:53   #5
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Country: UK - England
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good morning here is your answer as promised
p/n 24-65339 is no longer available
p/n 24-64878 is available from Belgium (we dont have stock) as a point of interest that spring is used on a wide range of Merc/Mar OBMs including some Verados
have a good day
alan
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