air bubble in Ritchie compass- simple repair.

eianm

.
Jul 7, 2010
522
Hunter 42 Sydney
My H42 is now 23 years old, and although I have updated just about everything- I am also finding occasional maintenance conundrums. A recent one that I thought I should list here is that I recently noticed an air bubble in the lens of my Ritchie compass.I went and Googled Ritchie and find they simply advise the compass needs to be returned to them for a rebuild- when I am in Australia and Ritchie are in your good old US of A , that it is not really viable, so I dug deeper. I found a thread on cruisers forum on this very issue.
To cut a long story short- the cause of my loss of fluid as the main "O" ring on the fill plug which had simply worn. Locating a replacement was easy and very cheap at my local hydraulics guy ( 10 cents!) I then went to the hardware store and found a bottle of refined mineral spirits ( Parafin in the old language) at a cost of some $6- in my case it was labeled "unscented lamp and torch oil"-so to be sure , I called the manufacturer to confirm it was indeed parafin, which it was. This is exactly what Ritchie used until around 2004, when they changed to isopropel. I simply set the compass on my bench with the fill plug facing up- which also brought the air bubble to the fill hole. I straightened out a paper clip and used a syringe (minus needle) to run the parafin down the paper clip into the fill hole. Once completely full , simply refit the fill plug with the new "O"ring and DONE! Although this is slow - it works!
I now have a "refurbished" Ritchie compass with NO air bubble and all at less than $10 and probably less than an hours work!
 
Jan 18, 2013
76
Hunter 340 Bayfield Ontario
I did the same, and was all proud to! Three weeks later the bubble returned. GRRR, I hope yours goes well.
 
Sep 15, 2009
6,243
S2 9.2a Fairhope Al
I did the same, and was all proud to! Three weeks later the bubble returned. GRRR, I hope yours goes well.
i think i read some where that you need to chill the oil before you fill the compass but i have not tried this yet ...but i do have a new bubble after filling mine aswell so i will try again
 
Sep 2, 2009
339
Hunter Vision-32 New Hamburg, NY
Ritchie Rebuild

I replaced the globe and gaskets in my 1990 Ritchie ... I had the odorless mineral spirits in my freezer overnight before filling the compass ..... 2 years on and still perfect ... knock on wood ;-)
 
Jan 4, 2006
7,161
Hunter 310 West Vancouver, B.C.
I had my Ritchie refilled a number of years back by an instrument company.

The story is that the comapss was filled with oil and then maintained upside down at a near perfect vacuum for 48 hours. The vacuum removed any dissolved air in the oil. The vacuum was removed and then the compass was sealed. This method prevented the oil coming in contact with air again before the compass was sealed.

Still bubble free today.
 
May 28, 2009
764
Hunter 376 Pensacola, FL
Compass Burping For Beginners

There's also a bellows assembly inside the compass that flexes as the oil (paraffin) expands and contracts with temperature changes. It gets brittle with age and eventually cracks. When you have Ritchie do a rebuiid, they replace this part as well. When I recently sent our compass back to Ritchie, they also put a new globe on, replaced the compass rose, and installed the latest internal LED light, in addition to all the internal seals and rubber parts.

Glad your fix solved your problem. But it was by no means equivalent to the job Ritchie does.

Here's a post from our blog about our experience with Ritchie:

http://www.lifeonthehook.com/2014/05/28/best-way-burp-compass/
 

weinie

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Sep 6, 2010
1,297
Jeanneau 349 port washington, ny
I had a bubble in mine several years ago. My mechanic at the time told me to fill it with mineral OIL! Well, I don't know if I misheard him or he told me wrong, but I topped it off with the mineral OIL.
Low and behold, my compass has been working fine ever since! - and no bubble!