| Author |
Message |
    
kayak
Advanced Member
Username: kayak
Post Number: 44
Registered: 06-2016
| | Posted on Wednesday, November 02, 2016 - 03:37 pm: | 
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Hi, was just reading the Bait engine thread, really cool. And I noticed that RAA made(!) some new primers and realized that mine is worn out and leaks when adding gasoline for starting. In the boat this wont be good as a little gas becomes a lot of vapor in a bilge.
I am not able or equipped to make a new one, so is there a source or substitution available for these? And I should ask if "they all leak" to some extent or are good ones generally tight.
The other item is what to use for the oil sponges at the water pump eccentric, and the various oil cups. I couldnt find through a search (not sure what it is called formally). Also wonder what was used "back in the day".
as always, advice appreciated, thank you |
kayak
Advanced Member
Username: kayak
Post Number: 45
Registered: 06-2016
| | Posted on Wednesday, November 02, 2016 - 04:05 pm: |
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I may have partially found an answer, as it occurred to me to search ebay and there are some (new?) ones listed but unknown on quality of course.
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR10.TRC0.A 0.H0.Xprimer+cup.TRS0&_nkw=primer+cup&_sacat=0 |
ernie
Senior Member
Username: ernie
Post Number: 2329
Registered: 01-2002
| | Posted on Wednesday, November 02, 2016 - 04:31 pm: |
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Use felt for the oil sponges.
I have an old boot liner that I have been using parts of for years or go to the fabric store and get a piece of dark colored felt. |
raa
Senior Member
Username: raa
Post Number: 129
Registered: 02-2007
| | Posted on Wednesday, November 02, 2016 - 04:51 pm: |
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After looking in all the nooks and crannies in Rockford I found that 1/4" npt reamer is what was used on the one I copied. Still not 100% but acceptable. Some of the Dippy guys lap them with ?? tooth paste |
david_doyle
Senior Member
Username: david_doyle
Post Number: 100
Registered: 03-2013
| | Posted on Wednesday, November 02, 2016 - 05:29 pm: |
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Kayak
Sorry but this aint a buy your way out of hiccup. You are perfectly equipped and perfectly capable of making or repairing a primer cup. (sans lathe even)
I have never seen one apart except in pictures but my guess is that some errant heat softened your spring during disasembly (?). Lucky for you a torch and a bit of reading will get that spring or a new one back to where it needs to be.
Making springs is one of those things that a fellow should just be able to do. scribd has a copy of the "Workshop Practice Series" book that covers spring making.
I guess maybe your taper could be marred or 'worn'. If so as raa says and lap it back into mating well. What ever you learn on the primer cup will likely serve you well on a future mixer/carb job.
Old chalk board reasers have some nice felt.
Sounds like your getting close to making smoke and then onto the device! Looking forward to it.
Cheers |
kayak
Advanced Member
Username: kayak
Post Number: 46
Registered: 06-2016
| | Posted on Wednesday, November 02, 2016 - 05:41 pm: |
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thanks guys for the replies. felt is all set now I know what to use. primer cup, here is a picture, it appears the hole is enlarged and there is scoring. not sure can be fixed and almost certainly not by me. dave the spring feels strong. |
kayak
Advanced Member
Username: kayak
Post Number: 47
Registered: 06-2016
| | Posted on Wednesday, November 02, 2016 - 05:42 pm: |
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1238
Registered: 07-2002
| | Posted on Wednesday, November 02, 2016 - 07:30 pm: |
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Do a search on plug valve grease, don't know how long it will last on a worn valve, it seals them and makes them operate smooth. It's like a wax. |
johnoxley
Senior Member
Username: johnoxley
Post Number: 167
Registered: 04-2010
| | Posted on Wednesday, November 02, 2016 - 08:09 pm: |
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We use Brasso or similar metal polish to lap in brass drain cocks on steam plant. Toothpaste works OK as well. Prolonged lapping will see the plug travel deeper and deeper and you need to minimise this. Check that holes still align.
Use scourer pads for oil cups - Filters and usefully slows oil flow. |
raa
Senior Member
Username: raa
Post Number: 130
Registered: 02-2007
| | Posted on Wednesday, November 02, 2016 - 08:23 pm: |
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Look for gas cock grease. |
scott_n
Senior Member
Username: scott_n
Post Number: 284
Registered: 02-2008
| | Posted on Thursday, November 03, 2016 - 08:51 am: |
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their is a great product called time saver for lapping soft mettle it wont leave grit in brass or Babbitt it has bin around fore years. |
bruce
Senior Member
Username: bruce
Post Number: 586
Registered: 07-2002
| | Posted on Thursday, November 03, 2016 - 09:29 am: |
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I suggest Dow Corning silicone stop cock grease available at your area commercial plumbing supply house. |
scott_n
Senior Member
Username: scott_n
Post Number: 285
Registered: 02-2008
| | Posted on Thursday, November 03, 2016 - 10:04 am: |
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try www.newmantools.com/lapping/time.htm |
kayak
Senior Member
Username: kayak
Post Number: 89
Registered: 06-2016
| | Posted on Friday, December 09, 2016 - 05:17 pm: |
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OK just to close this out, I bought Brasso, and used it like lapping compound by "lubricating" the tapered section with Brasso, I grabbed the part where the spring goes with my cordless drill and spun it a little while pulling the drill. Then cleaned out the Brasso, and it doesnt appear to leak gasoline now. The hole inside is only shifted a little bit. |
kayak
Senior Member
Username: kayak
Post Number: 91
Registered: 06-2016
| | Posted on Sunday, December 11, 2016 - 12:57 pm: |
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And letting gas sit in the cup for a minute, no leaks. Thanks to all for the advices above.
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