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More oil leakage

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Adrian Coop Cooper

Joined: 02 Feb 2010
Posts: 37
Location: Vancouver, BC

Posted: Wed Jul 03, 2013 8:37 pm Post subject: More oil leakage

Hi all. My engineer and I have been tracking down an oil leak on my CJ's Housai 285hp. With the cowls removed and a good Varsol wash down/spray we ran the engine. Sure enough we found the problem, the starter distributor was loose. Even though the "lock tabs" were correctly in place, the three 7mm nuts had backed off. Now any of you who have had this issue know that these nuts are a B***h to get at and tighten.

After two hours of work and several specialty bendings of 7mm wrenches they are now tight. (I need to go buy replacement wrenches tomorrow)The space behind the air lines and banjo fittings is too small for a socket and its impossible to even get a universal socket in there. Has any one been able to find Turbine nuts that fit those studs?

The smaller size of the Turbine nuts should make this a manageable job and, of course, they are self locking. I don't know if there is an equivalency of the studs to a US SAE size, but that would be great. Any one have the answer to that?  

Thanks Guys.

Coop.

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Coop

wlannon(at)shaw.ca
Guest

Posted: Thu Jul 04, 2013 8:01 am Post subject: More oil leakage

Hi Coop;



There are self-locking 4 x 0.7 mm nuts available in both carbon and 

stainless steel from Fuller Metric and other suppliers.  Like all nylon type 

lock nuts they should nut be used in areas where the temperature may exceed 

250 deg.F (120C).   Generally OK for many areas under the cowl but should be 

evaluated for specific areas on the engine



I have never been impressed with tab washers and in some cases prefer a 

simple split type lock washer.



Walt



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desmor944(at)aol.com
Guest

Posted: Fri Jul 05, 2013 10:13 am Post subject: More oil leakage

Walt and Coop,

   

  Agree on the limitations of tab washers and self locking nuts in general.  I work in the world of industrial gas turbines and steam turbines where these machines are run 8,000 to 9,000 equivalent operating hours per year, with overhauls scheduled at 40,000 hours or more.  Vibration and high temperatures are the norm during operation.

   

  The solution to keeping parts in place is the extensive use of Nord-Lock washers under bolt heads and nuts on studs.  These are the ultimate replacement for split or star type lock washers.  The only caution would be against use with a hardened (> Rockwell 40) nut.

   

  Nord-Lock washers are readily available from Fastenal, Grainger, McMaster-Carr, MSC Direct, etc.  Sizes start at M3, and prices are about $0.50 per pair up to M8.

   

  Manufacturer's web site is www.nord-lock.com , and this link will show how the washers work www.youtube.com/watch?v=mgwmuZuJ02I .  The new X-Series is overkill for our applications; the standard wedge locking washer is sufficient.

   

  Many pairs have found their way firewall-forward on my CJ.

  

  Rich Desmond

  

  

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f4ffm2(at)roadrunner.com
Guest

Posted: Fri Jul 05, 2013 10:44 am Post subject: More oil leakage

I learn something nearly everyday...and occasionally I learn something spectacularly useful...such as Rich's info about Nord-Lock washers.

Roger Baker



On Jul 5, 2013, at 11:01 AM, desmor944(at)aol.com (desmor944(at)aol.com) wrote:



[quote] Walt and Coop,

   

  Agree on the limitations of tab washers and self locking nuts in general.  I work in the world of industrial gas turbines and steam turbines where these machines are run 8,000 to 9,000 equivalent operating hours per year, with overhauls scheduled at 40,000 hours or more.  Vibration and high temperatures are the norm during operation.

   

  The solution to keeping parts in place is the extensive use of Nord-Lock washers under bolt heads and nuts on studs.  These are the ultimate replacement for split or star type lock washers.  The only caution would be against use with a hardened (> Rockwell 40) nut.

   

  Nord-Lock washers are readily available from Fastenal, Grainger, McMaster-Carr, MSC Direct, etc.  Sizes start at M3, and prices are about $0.50 per pair up to M8.

   

  Manufacturer's web site is www.nord-lock.com , and this link will show how the washers work www.youtube.com/watch?v=mgwmuZuJ02I .  The new X-Series is overkill for our applications; the standard wedge locking washer is sufficient.

   

  Many pairs have found their way firewall-forward on my CJ.

  

  Rich Desmond

  

  

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mark.bitterlich(at)navy.m
Guest

Posted: Mon Jul 08, 2013 7:22 am Post subject: More oil leakage

This one's a keeper.  



Thanks. 



Mark

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skidmk

Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

Posted: Tue Jul 16, 2013 10:09 am Post subject: Re: More oil leakage

Gents,,,,



going to try and chase down some leaks are selves this weekend.  We never thought to consider tightening bolts held in place with the tabs. (thanks)



without sounding too dumbass,,, pushing these tabs our of place?  special tool? screwdriver? pliers?  any tips?



thanks



M

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Mike "Skidmk" Bourget
Ottawa, Ontario

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