GFP 40+ starts but won't get going
Moderators: John@sos, charlesp, Charles uk, RickUK, Petergalileo
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- Posts: 2484
- Joined: Thu Apr 04, 2013 2:26 pm
- Location: bristol
Re: GFP 40+ starts but won't get going
You can be a bit "ham fisted" with it, just dont go too heavy with the pressure you apply to the drill. Better to break the drill bit not the casting.
Some of the hard compacted crud may need a light tap with a screwdriver/small hammer combination to get it moving.
The more you remove, the easier it is to see where the jackets are.
Slow and steady, dont rush.
Might make things much easier if you remove the cylinder from the crankcase. 2 bolts on the back is all once you seperate the lower leg from the powerhead. Remove the exhaust tube and water feed pipe.
At the exhaust port you'll see the water pipe fitting which ideally if you can remove it makes access to the bottom of the jacket a bit easier. Heat is your friend here.
Looking forward to seeing some pics of the finished article.
Jon
Some of the hard compacted crud may need a light tap with a screwdriver/small hammer combination to get it moving.
The more you remove, the easier it is to see where the jackets are.
Slow and steady, dont rush.
Might make things much easier if you remove the cylinder from the crankcase. 2 bolts on the back is all once you seperate the lower leg from the powerhead. Remove the exhaust tube and water feed pipe.
At the exhaust port you'll see the water pipe fitting which ideally if you can remove it makes access to the bottom of the jacket a bit easier. Heat is your friend here.
Looking forward to seeing some pics of the finished article.
Jon
Re: GFP 40+ starts but won't get going
Masonry bit is the best tool. I use a 5mm masonry bit in a small hand held battery drill, will not touch the cast iron but gets the crud. Just be careful not to bend and break the bit, or you will have all sorts of hassle getting it out.
When you think you have cleared it, whack the old gasket back on with a bit of RTV and then use the garden hose trick, as on the FAQ page.
If you get squirted in the eye there is still a blockage.. Often in the underside of the block, where the water pipe enters... Pain, but to get to it, the motor must be separated from the gearbox and leg, and the exhaust removed. Then the water pipe fitting unscrewed from the block to allow access. Have fun!
(By the way only use water as it is incompressable---- do not bother to use air, it can compress and go through a pin hole, expand and come out the other end and you will still be blocked and none the wiser!)
you are getting there and its all good clean fun!
Regards,
John
SOS
When you think you have cleared it, whack the old gasket back on with a bit of RTV and then use the garden hose trick, as on the FAQ page.
If you get squirted in the eye there is still a blockage.. Often in the underside of the block, where the water pipe enters... Pain, but to get to it, the motor must be separated from the gearbox and leg, and the exhaust removed. Then the water pipe fitting unscrewed from the block to allow access. Have fun!
(By the way only use water as it is incompressable---- do not bother to use air, it can compress and go through a pin hole, expand and come out the other end and you will still be blocked and none the wiser!)
you are getting there and its all good clean fun!
Regards,
John
SOS
Re: GFP 40+ starts but won't get going
Thanks for all the tips. I'll have a go at this tonight and the next few evenings. Its just so unpleasant out there at the moment....
"...not to bend and break the bit, or you will have all sorts of hassle getting it out"...sounds like the voice of experience speaking
I will post photos when I make any progress.
Cheers
Steve
"...not to bend and break the bit, or you will have all sorts of hassle getting it out"...sounds like the voice of experience speaking
I will post photos when I make any progress.
Cheers
Steve
Re: GFP 40+ starts but won't get going
Yup Got the Tee too!
Regards,
John
SOS
Regards,
John
SOS
Re: GFP 40+ starts but won't get going
Tried the back flush and as predicted got soaked. So now planning on pulling the barrel after a day or so soaking in penetrating oil.
When I do so I'll post pics of the rings to see if they need replacing.
Order of work is 1) separate power head from transmission (exhaust stays with power head) then 2) remove exhaust and water pipe from barrel finally 3) remove barrel from crankcase. Correct? Is the water pipe bolted in or simply a tight fit in a socket?
Cheers
Steve
When I do so I'll post pics of the rings to see if they need replacing.
Order of work is 1) separate power head from transmission (exhaust stays with power head) then 2) remove exhaust and water pipe from barrel finally 3) remove barrel from crankcase. Correct? Is the water pipe bolted in or simply a tight fit in a socket?
Cheers
Steve
Re: GFP 40+ starts but won't get going
Actually I'm in and all was self evident. Fasteners were not seized and so it came to bits okay. Exhaust needed heat but came off eventually. Biggest challenge was the prop leg bolt between the propshaft tube and the exhaust. A real challenge to get a spanner onto!
Rings look bright and shiny. No breaks or rust.
Rings look bright and shiny. No breaks or rust.
Re: GFP 40+ starts but won't get going
Photos of rings etc
Steve
And the exhaust port and water port
Crud is now clear to the extent that I can blow through easilySteve
- Charles uk
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- Joined: Wed Feb 27, 2008 4:38 pm
- Location: Maidenhead Berks UK
Re: GFP 40+ starts but won't get going
John stocks a tool kit with a spanner for that job, have a look.
Make it idiot proof and someone will make a better idiot.
Re: GFP 40+ starts but won't get going
Aha! I will. Thanks.
Re: GFP 40+ starts but won't get going
Anyone used one?
Re: GFP 40+ starts but won't get going
Yes, as long as you can get it around the nut it use it.
Re: GFP 40+ starts but won't get going
Good point... it is not going to fit is it.
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- Posts: 2484
- Joined: Thu Apr 04, 2013 2:26 pm
- Location: bristol
Re: GFP 40+ starts but won't get going
Heat and soak with penetrating fluid. Repeat as required.
Locking pliers (vice grips) work quite well, but may end up chewing the nut a bit. New nuts always available.
Jon
Locking pliers (vice grips) work quite well, but may end up chewing the nut a bit. New nuts always available.
Jon
Re: GFP 40+ starts but won't get going
That offset spanner works a treat. So far reassembly has gone well the hardest part being getting the exhaust lined up to allow the little screw into the block casting back in.
However that done I'm now into cleaning and assembly of the fuel and ignition systems.
Steve - feeling optimistic!
However that done I'm now into cleaning and assembly of the fuel and ignition systems.
Steve - feeling optimistic!
Re: GFP 40+ starts but won't get going
Good to see you have stuck with it. Once you have been through the engine they will generally work reliably for a long time.
Looking forward to see it run.
Looking forward to see it run.