| Author |
Message |
    
Simon Neal
New member
Username: srneal22
Post Number: 1
Registered: 07-2011
| | Posted on Saturday, July 30, 2011 - 03:17 pm: | 
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Just installed my P66 into a Marcon Tomahawk 25'
I didn't do the re-build, western Marine did it and the chap has since died. The engine has been sitting around for a couple of years.
Engine started first time and runs very sweetly. But under power it seems to struggle. It will push her along at a couple knots but doesn't like any waves or tidal stream against her. She doesn't sound to get up to 3000 revs and opening the throttle, under power, more than about 1/3 and the engine just fades away. After running for about an hour under load (tied to a pontoon) she was very smoky once out of gear.
So all you experts out there, is this carburation or timing or prop size (no idea what that is - came with the boat) or all that is to be expected?
Help needed, I'm off sailing in her this weekend and could do with something reliable.
Thanks
Simon |
Thomas P Montagu
Member
Username: tom_montagu
Post Number: 4
Registered: 12-2011
| | Posted on Friday, December 30, 2011 - 06:21 am: |
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Simon; 2 suggestions--(1)tedious and as messy as it might be, make sure the exhaust is clean internally--a blocked exhaust will cause your problem especially in a 2-stroke,(does the exhaust exit the boat above the water or under the water?) and (2) make sure you are running the correct fuel/oil ratio--should be between 1:48 and 1:50 (1/3rd pint in 2 gallons or 20cc in 1 litre). It might also be that having sat around for a couple of years (and it might be more than that as Paul Pickup the owner of Western Marine died over 4 years ago)the piston rings are seized in the pistons--hope these suggestions help as you have a nice boat in the Marcon 25. |
Billy osullivan
Visitor
| | Posted on Saturday, July 04, 2015 - 12:53 pm: |
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Hi I have a p66 engine it is fitted in a 26ft long keel wooden sailing boat. Can anyone tell me roughly how many gph she might use. Lets say it's calm with no wind and would she have enough power to push it against a 3 knot tide.
Many thanks Billy. |
Hugo de Rrick
Member
Username: hugo_de_rrick
Post Number: 4
Registered: 10-2014
| | Posted on Sunday, July 05, 2015 - 10:42 am: |
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Hi Billy -
Have a gad @ the attached Stuart 'typical performance' table - its has the P55 driving a 29" sloop @ ~ 6 knots - it'll give you an idea of what to expect...
When running @ full chat, the P66 uses ~ 1 pint per HP per hour...
Cin cin,
H.
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Billy osullivan
Visitor
| | Posted on Wednesday, July 08, 2015 - 03:55 am: |
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Thanks for the reply. This is just what I was looking for for as I just bought the boat and didn't know what to expect from the engine.
Thanks again Billy 😊 ⛵ |
ROSSCOLEMAN
Visitor
| | Posted on Wednesday, May 04, 2016 - 07:43 pm: |
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I have a P66 engine and the water pump has not got the screw fitting at the base as shown in the manual. It is leaking quite badly when operating . There does not appear to have any O ring at the base. High up in the cylinder near the top there does appear to have a groove for an O ring but up there would defeat the purpose.There is no opening to apply grease. What grease do you recommend. |
