RGS oil cooler hoses and fittings

Alzero

Alzero

Hero member
Location
DaNang Vietnam
The black rubber hoses from the engine to the oil cooler are over 30 years old and due for replacement. Does anyone know what size the fittings are? I would like to verify that my local supplier has the correct parts before I take things apart and I do not have a metric thread gauge.
 
If you have the fittings with long hexagonal bits where the hose connects, they can be disassembled and the rubber hose renewed (similar to Goodrich brake fittings). 10mm/⅜" ID oil/fuel hose from Gates works a treat.

AfaIk, these fittings are quite unique to Laverda bikes, good opportunity to replate them.

piet
 
sfcpiet said:
If you have the fittings with long hexagonal bits where the hose connects, they can be disassembled and the rubber hose renewed (similar to Goodrich brake fittings). 10mm/⅜" ID oil/fuel hose from Gates works a treat.

AfaIk, these fittings are quite unique to Laverda bikes, good opportunity to replate them.

piet
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Are these the rebuildable type?
 
No, these are crimped and cannot be rebuilt, sorry.

Must be a very late RGS. This hose type, along with the cooler, was generally used on the 1000SFC, or have been replaced at some point.

In my experience, the rubber rarely perishes. If there are no signs of internal dissolving, the entire hose assembly can be re-plated as-is, as long as there are no aluminium alloy components involved.

piet
 
This would be cadmium plating? I had the nuts and bolts cad plated silver and the brake discs gold cad plated like many aircraft components. This was in the late 1980’s when I did a chassis rebuild and frame color change to a bluish silver. I painted the body a blend of Porsche Tangerine/Blood-orange and Guards Red.

At the time I was just starting a job in the Flight Test Dept at McDonnell-Douglas and everything we put on an aircraft was high-vis orange, so I wanted to be a bit different from the Laverda racing color.
 
If you can get cadmium, go for it.

Original would have been zinc, cadmium has been outlawed in the EU since forever...

The hose fittings would have been yellow zinc. The nipples in the crankcase white/blue zinc.

piet
 
Piet, so you mean if they are steel and rubber only, the plater can did it all in?

Kind regards,
Jacques
 
this is what is known as the "big nut" oil cooler, very often the male thread will tear off with the nut when you dismantle it, this can be repaired, by welding half of a hose adapter to the cooler, not hard, the hoses can be made up by good hose people, the cranked ends are a bit difficult to find (engine end) but do able, and stainless crankcase adapters can also be obtained, probably from Ralph at Motalia (UK), he might even have the hoses!
CLEM
 
Thanks Clem for the good pointers. I was in this case though, more thinking about keeping the original ones and having them replated as per Piets description. I just want to know, if and when I get them undone, I can supply them to the platers, and they can stick both complete hoses with fittings into the bath and replate them.
Kind regards,
Jacques
 
chrisk said:
My right boot shining in the moonlight makes me beg to differ. East roadside fix, bypass the leaking hose and cooler with the good one.
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Yeah, the Oz sun does strange things... ;)

Only a little superficial cracking sometimes, never found a split hose here Chris.

piet
 
My RGA had those M22 crimped style hoses, #25xx so were in production from maybe '83? My bike is one owner living in a dry part of Australia, (to put it in perspective I had a 20yr old Alfa33 with no rust!) and one of those M22 nuts would absolutely not come off the cooler and I had to cut the nut in half. I ended up cutting the threads off the cooler and adding some AN-8 weld-on fittings and making new lines.

If you can get them off though... Piet is (as always) right and they can be re-plated in bright zinc. Thomas T. Wrecker esq has done a few of them, both those and the earlier type.
 
Take the pipes off, take them to a local truck pipe supplier and they will usually make them up for you while you wait, cost is also usually less than the cost of re-plating and pissing about.
Good luck
J
 
Maybe where you live J, but here at least no hose shop has heard of metric fittings - especially something like M22. You can special-order some metric series compression fittings to make up to standard Earles/etc type hose but the choice is limited and almost always days/weeks or these days months of lead time.
And a certain type of Laverda enthusiast like to have the original stuff. :D
 
probably not useful, but I have had very few problems in getting the fittings that I need from Goodridge at Exeter airport here in the UK,
I have a spare M22 X cant remember what, spare, it is anodised blue but that does not survive the welding and returns to bare alloy. The easy part is sawing off the not required end of the adapter, the hard part is the need to have a proficient alloy welder on hand, and that is not me, I never did get the training needed, sheet alloy with a gas flame YES, but castings etc with TIG, definately not, mainly because I know three people who do it extremely well, that makes one lazy!
CLEM
 
I wonder if a shop that services Asian made mini earthmovers and excavators would have access to metric fittings? There are a number of smaller pieces of equipment that could use similar sized hoses….. ill look around. We are in an agricultural part of California and I see a lot of smaller stuff in the vinyards and on job sites. If that doesn’t work, I’ll try to remove the cooler with the hoses attached and paint the cooler black and the fittings with cadmium-look paint from Eastwood.
 
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