paw .19 tbr clicks when the prop is fliped
04-18-2019, 05:18 PM
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paw .19 tbr clicks when the prop is fliped
Got a used PAW .19 tbr mark 2 diesel the other day. When you flip the prop over by hand it makes a clicking sound. Is this normal?
I have a PAW .09 and it does not make any noise like that.
Should I try and run it? It turns over smoothly and seems to have good compression.
Thanks for any advice! Ed
I have a PAW .09 and it does not make any noise like that.
Should I try and run it? It turns over smoothly and seems to have good compression.
Thanks for any advice! Ed
04-21-2019, 05:07 PM
#2
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Got a used PAW .19 tbr mark 2 diesel the other day. When you flip the prop over by hand it makes a clicking sound. Is this normal?
I have a PAW .09 and it does not make any noise like that.
Should I try and run it? It turns over smoothly and seems to have good compression.
Thanks for any advice! Ed
I have a PAW .09 and it does not make any noise like that.
Should I try and run it? It turns over smoothly and seems to have good compression.
Thanks for any advice! Ed
PAW can supply and fit a new one.
04-22-2019, 01:39 AM
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Thank you for your advice,I will remove the rear cover and check it.
Ed
Well, gazimoto I believe you’re correct.
I took off the cover and the “big end” of the rod looks ok,
but I used a soft piece of wood to push on the piston and keep it stationery.
There is about 3 or 4 degrees of play when I rotate the prop.
Thank you again for your help. Ed
Ed
Well, gazimoto I believe you’re correct.
I took off the cover and the “big end” of the rod looks ok,
but I used a soft piece of wood to push on the piston and keep it stationery.
There is about 3 or 4 degrees of play when I rotate the prop.
Thank you again for your help. Ed
Last edited by LONGREDDOG; 04-22-2019 at 04:17 AM. Reason: Up date on results.
04-25-2019, 07:28 AM
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Repair may be needed.
The big end of the con rod looks ok, I can't see the small end that's on on the wrist pin but I suspect that's where the play is.
Im going to send it to be checked out soon.
Ed. Thank you all for your help!
05-14-2019, 05:50 AM
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just a quick up-date, called and talked to Dr. Diesel (Eric Clutton). He “talked” me through removing the con rod and l was able to get it out. The small end is damaged almost broken in two. I’m sending the part to him so he can match it to the correct one, as there’s several different rods that the .19 Tbr. used by PAW.
Ed Stout
Ed Stout
05-16-2019, 11:26 PM
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If you consistently overcompressed it , or run fuel without ignition improver and really wind down on the compression screw, then it's quite easy to do with a PAW. Some sizes (eg PAW 09 Bluehead) were notorious for having a crank pin that wasn't always perpendicular to the liner centre-line, or parallel with the crankshaft centreline. The weakest part of the assembly was the little end which wore first.
Last edited by qazimoto; 05-16-2019 at 11:29 PM.
05-17-2019, 01:53 PM
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PAW .19 TBR FULL of CARBON (was 19TBR clicks when prop is flipped)
Well. I've gotten a lot of good advice here on this thread so far, maybe you can help with something else.
When I took off the piston the crown has a lot of very brunt on carbon. I had to scrub (with a scrubbing pad) and soak in a cleaner in order to locate the small mark that shows which end to press out the wrist pin.
I had tried to scrape it off with a wooden stick, but that did not do a thing.
The bottom of the contra piston is also covered in the same hard black mess. Is there any EASY chemical or other method of removing it?
I don't want to dismantle the engine any further if I can help it. Should I just leave it alone and run it as it is?
Thankyou, Ed Stout
i
When I took off the piston the crown has a lot of very brunt on carbon. I had to scrub (with a scrubbing pad) and soak in a cleaner in order to locate the small mark that shows which end to press out the wrist pin.
I had tried to scrape it off with a wooden stick, but that did not do a thing.
The bottom of the contra piston is also covered in the same hard black mess. Is there any EASY chemical or other method of removing it?
I don't want to dismantle the engine any further if I can help it. Should I just leave it alone and run it as it is?
Thankyou, Ed Stout
i
05-17-2019, 03:36 PM
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My Feedback: (1)
Well. I've gotten a lot of good advice here on this thread so far, maybe you can help with something else.
When I took off the piston the crown has a lot of very brunt on carbon. I had to scrub (with a scrubbing pad) and soak in a cleaner in order to locate the small mark that shows which end to press out the wrist pin.
I had tried to scrape it off with a wooden stick, but that did not do a thing.
The bottom of the contra piston is also covered in the same hard black mess. Is there any EASY chemical or other method of removing it?
I don't want to dismantle the engine any further if I can help it. Should I just leave it alone and run it as it is?
Thankyou, Ed Stout
i
When I took off the piston the crown has a lot of very brunt on carbon. I had to scrub (with a scrubbing pad) and soak in a cleaner in order to locate the small mark that shows which end to press out the wrist pin.
I had tried to scrape it off with a wooden stick, but that did not do a thing.
The bottom of the contra piston is also covered in the same hard black mess. Is there any EASY chemical or other method of removing it?
I don't want to dismantle the engine any further if I can help it. Should I just leave it alone and run it as it is?
Thankyou, Ed Stout
i
PAW advise to just scrape the stuff off the piston top with a hobby knife blade. There are chemicals available for cleaning but I'd be cautious risking your valuable piston fit by using them. I'd also be inclined to not worry about the stuff on the contra piston. Once you get it running with good fuel, PAW suggests that carbon buildup won't be a serious problem, most of it it'll blow out the exhaust. That's also my experience. It's ok to clean it off if you ever have to remove the contra but otherwise it's too much trouble on a well running engine.
I have quite a few of the .15 TBR GTS PAWs which share many components with your .19. They're great engines with an ultimate power almost reaching Nelson standards.
Last edited by qazimoto; 05-17-2019 at 03:46 PM.
05-17-2019, 04:52 PM
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Thanks, guess I’ll leave well enough alone! Hope Dr. diesel can match the damaged con rod so I can try and run it soon.
Thank you again for your help, Ed Stout
Thank you again for your help, Ed Stout
Last edited by LONGREDDOG; 05-17-2019 at 04:54 PM. Reason: Misplaced words
01-18-2020, 02:08 PM
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I have used a scotch brite pad and a small dowel to get to the top to clean off the carbon on the contra piston.
Cut the scotch brite pad into a strip that is 1/2" wide, now use a 1/4" dowel and fold the 1/2' strip of scotch rite over the dowel and shove it into the piston sleeve.
turn the dowel while holding the scotch brite in place. The pad will remove the carbon build up on the contra piston and transfer ports.
After doing this you'll have to treat your engine as if it is a new one and do a break-in period again.
sosam117
01-18-2020, 02:26 PM
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Ed,
I have used a scotch brite pad and a small dowel to get to the top to clean off the carbon on the contra piston.
Cut the scotch brite pad into a strip that is 1/2" wide, now use a 1/4" dowel and fold the 1/2' strip of scotch rite over the dowel and shove it into the piston sleeve.
turn the dowel while holding the scotch brite in place. The pad will remove the carbon build up on the contra piston and transfer ports.
After doing this you'll have to treat your engine as if it is a new one and do a break-in period again.
sosam117
I have used a scotch brite pad and a small dowel to get to the top to clean off the carbon on the contra piston.
Cut the scotch brite pad into a strip that is 1/2" wide, now use a 1/4" dowel and fold the 1/2' strip of scotch rite over the dowel and shove it into the piston sleeve.
turn the dowel while holding the scotch brite in place. The pad will remove the carbon build up on the contra piston and transfer ports.
After doing this you'll have to treat your engine as if it is a new one and do a break-in period again.
sosam117
the next time I have the head off, l will try your removal method. Thanks again, Ed Stout
01-18-2020, 02:59 PM
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If your PAW .19 has a DS head (Diesel Squish -- domed piston or domed contra piston) Don't worry too much about the carbon build up.
The DS head will remove it on its own.
I asked Tony at PAW what the purpose for the DS was for. Two things, it swirls the fuel ( like a hemi head) and it reduces the carbon build up.
I have some old PAW engines that don't have the DS head (in the contra piston). but Tony said they can be updated (for a price).
sosam117
The DS head will remove it on its own.
I asked Tony at PAW what the purpose for the DS was for. Two things, it swirls the fuel ( like a hemi head) and it reduces the carbon build up.
I have some old PAW engines that don't have the DS head (in the contra piston). but Tony said they can be updated (for a price).
sosam117
