| Author |
Message |
    
johntr
New member
Username: johntr
Post Number: 3
Registered: 10-2005
| | Posted on Thursday, September 24, 2015 - 06:50 pm: | 
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I am rebuilding my Chapman Seadog Engine and wondering if I can use cork gaskets for carb and exhaust? |
johnoxley
Senior Member
Username: johnoxley
Post Number: 141
Registered: 04-2010
| | Posted on Thursday, September 24, 2015 - 07:09 pm: |
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Cork OK for inlet/carb but I would use oil gasket material as cork can granulate and fail out on the water (Not an issue on display engine). Exhaust will need proper exhaust gasket material - from Repco/Supercheap/Robbos - 1.6 mm. should do fine - I find hard to avoid splitting at holes so I punch holes first then cut out. |
johntr
Member
Username: johntr
Post Number: 4
Registered: 10-2005
| | Posted on Thursday, September 24, 2015 - 07:53 pm: |
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John, thanks for the help. Off to Supercheap Auto this morning.
Here are some photos.
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johntr
Member
Username: johntr
Post Number: 7
Registered: 10-2005
| | Posted on Friday, September 25, 2015 - 08:07 pm: |
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Andy,
I made the gaskets from the right exhaust material. Pleased with the result and installed. Thanks for the help.
John |
johntr
Member
Username: johntr
Post Number: 8
Registered: 10-2005
| | Posted on Saturday, September 26, 2015 - 04:49 am: |
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More photos of the work completed today. All back together. Need to align the clutch to the engine for replacement in the boat. All pipes (copper for fuel and water) need to be attached and run for sometime in the garage before putting back into Sarah the boat.
Any advice or comment greatly appreciated.
John
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gregoryan
Senior Member
Username: gregoryan
Post Number: 125
Registered: 09-2004
| | Posted on Saturday, September 26, 2015 - 06:51 pm: |
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Interesting to see the original ratchet throttle lever!,, & that water pump grafted-on [from another engine?]
the Iron looks to be in very good condition under your Lovely paint job! Red really was the colour for Blaxlands
My Greyhound 6\ 8 HP came in Dark Blue!, took a while to get used to it, i think i'll eventually paint it Red. it has the same magneto as yours which has the 4 pole distributor, this seems original for mine, according to the early brochure pics & matching eng. numbers, but perhaps not for the 10HP Sea Dog. Not that this matters of course. [ these have a 2-lobe points-cam, but one of the sparks gets earthed inside the dizzy, makes-for terrible interference for radio, but i dont think they were invented back then, lol] Nice new Flywheel? You used to have a v-belt groove?, Can i see a side-on pic, as some had a somewhat conical rear face - which had the rim positioned a long way f'rd of the baseplate. |
johntr
Member
Username: johntr
Post Number: 9
Registered: 10-2005
| | Posted on Sunday, September 27, 2015 - 08:02 pm: |
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Greg,
I do have the original water pump, but the guy from whom I purchased the core of this motor had the pump you see on the engine. It dissent have the double bolts to attach the pump as you can see on the pump parts in photo below. The flywheel is one of two 'new' ones I have. I think I have enough parts to build a complete sedan engine. When I get this one in the boat will think about building another.
I am concerned re the gap between to the flywheel and the pump, is it okay?
 |
gregoryan
Senior Member
Username: gregoryan
Post Number: 126
Registered: 09-2004
| | Posted on Sunday, September 27, 2015 - 11:59 pm: |
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Do you mean that the cam strap may want to wander fore and aft? If-so, not sure if it will naturally tend to run square off the cam, finding it's centre under the pump, or not? ideally there'd be a lip on the cam fore and aft of the strap.
I have seen one Sea Dog engine with a bronze cam enclosure/ grease catcher, maybe thats what the gap was for??! Have you ran it like this? Interestingly; is it a Sea Dog flywheel? Anyone else got any suggestions? |
johntr
Member
Username: johntr
Post Number: 10
Registered: 10-2005
| | Posted on Monday, September 28, 2015 - 12:05 am: |
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It doesn't wander for and aft, runs straight and true. I don't have the cam enclose/grease capture. I just had the old pump in picture above. I believe it is a correct flywheel, same as the one i had previously and same as the other one I have.
When running it runs well and well behaved.
John |
senojn
Senior Member
Username: senojn
Post Number: 134
Registered: 08-2006
| | Posted on Wednesday, September 30, 2015 - 12:43 am: |
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Nice to see Aub Rose's name preserved in 'Copperplate ' |
qwilkin
Senior Member
Username: qwilkin
Post Number: 104
Registered: 08-2009
| | Posted on Wednesday, October 28, 2015 - 04:54 am: |
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Hi there I need some help . My Blaxland twin has been out of action for about 14 months and we are starting it up again.
It coughs and fires when using aero start or one of those things but does not continue on ???? sounds like lack of fuel could jet be blocked ??
Have checked mag and plugs and they spark , petrol mix is as per manual converted to metric . Fresh fuel in the tank ,
Have fuel at the carb the tickler brings in fuel any ideas. Carb was rebuilt by Todd and so should be in good nick
Any ideas Quinton
Quinton |
johnoxley
Senior Member
Username: johnoxley
Post Number: 148
Registered: 04-2010
| | Posted on Wednesday, October 28, 2015 - 04:22 pm: |
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Humble pie, but on a twin Seadog, I once left out the big hole in the middle of the carby to manifold gasket! Started with fuel in primer cups but ran for only a few seconds after each prime. Also had a big Chrysler M8 that only ran on 4 of 8 cylinders due to mud wasp nest in a NOS fuel line, so check for blocked air inlet??
In this case suspect blocked or accidentally closed in main jet - unwind needle a bit or remove to clear. Think 1.5 turns out is initial setting? Rebuilt carby can pick up blockage on install from grit introduced from fuel line. |
qwilkin
Senior Member
Username: qwilkin
Post Number: 105
Registered: 08-2009
| | Posted on Wednesday, October 28, 2015 - 08:32 pm: |
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Thanks John mine has never had a gasket between carb and inlet and it's not in the manual either , did strip the carb and found a fair size piece of junk in the end of the jet so looks like it was starved so hope tonight goes well will set needle 1and half turns and using fuel at 32 to 1 will report on activity Quinton |
qwilkin
Senior Member
Username: qwilkin
Post Number: 106
Registered: 08-2009
| | Posted on Thursday, October 29, 2015 - 05:37 am: |
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John all things going well lots of junk came out of the needle seat so all clear . Put it all back together and it started first time it runs but get a lot of back firing ??? Can this be needle needing adjustment ??
Quinton |
miro
Senior Member
Username: miro
Post Number: 828
Registered: 11-2001
| | Posted on Thursday, October 29, 2015 - 11:11 am: |
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Backfiring usually indicates the mixture is too lean.
Open up the needle valve by 1/3 to 1/2 turn.
miro |
qwilkin
Senior Member
Username: qwilkin
Post Number: 107
Registered: 08-2009
| | Posted on Thursday, October 29, 2015 - 04:34 pm: |
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Thanks Moro thought that might be the case will do tonight and test again Quinton |
