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A: Oil Pipework Oil Leak or Not?

nigsey

Active Website User
VOC Member
I’ve only owned my HRD C Rapide a few months and squeezed in one short test ride before the winter weather set in. I changed the engine oil and have not run it since but noticed a few weeks ago quite a few drops of oil appearing in the clean drip tray, this was not due to spilt oil! The breather exits directly beneath the engine and there is evidence of oil on or around the pipe and the underside of the engine casing. I have been turning the engine over recently but not starting it as I’ve drained the fuel for winter. I did this again a few days ago and low and behold there‘s not been a single drop of oil on the freshly cleaned drip tray since. Is this normal behaviour for a twin?
 

Cyborg

Well Known and Active Website User
VOC Member
No..... normally the tray would be overflowing.

Probably just a small amount of residual oil that took time to collect and form droplets. What you experienced there doesn’t seem unusual to me. The engine might sump while sitting.... oil slowly drains from the tank into the crankcase, but I don’t think just kicking it over would cause it to head out the breather. The more oil there is in the sump, the more likely it will find a way out though.
 

Bill Thomas

Well Known and Active Website User
VOC Member
No..... normally the tray would be overflowing.

Probably just a small amount of residual oil that took time to collect and form droplets. What you experienced there doesn’t seem unusual to me. The engine might sump while sitting.... oil slowly drains from the tank into the crankcase, but I don’t think just kicking it over would cause it to head out the breather. The more oil there is in the sump, the more likely it will find a way out though.
Very Funny !.

If you have a breather pipe facing down, You will get something out of it ?.
Even a bit of mist will cling to the side and then drip a bit,
The "C" was not a good idea,
I think you should have the pipe going up for as long as possible so any oil could run back ?.
Just my thoughts.

It might wet sump over the winter, A lot of us have that problem,
What happens is you look in the oil tank, In the Spring Time, And see it needs oil !!,
So you top the oil up and start the bike, Then the extra oil in the sump is pumped back in the oil tank and it overflows !! All over the Engine, We have all done it at some time ??.
It is a dry sump engine but you will always have a bit in there,
There is a drain plug that you can get to via a hole in the front footrest plate,
Below the Chain case.
The thing is if your oil is just above the bar you can see through the oil cap now !!,
And you remember, If it's below that next Spring , It has wet sumped , Sorry I have gone on TOO much.
Good Luck.
 
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nigsey

Active Website User
VOC Member
Very Funny !.

If you have a breather pipe facing down, You will get something out of it ?.
Even a bit of mist will cling to the side and then drip a bit,
The "C" was not a good idea,
I think you should have the pipe going up for as long as possible so any oil could run back ?.
Just my thoughts.

It might wet sump over the winter, A lot of us have that problem,
What happens is you look in the oil tank, In the Spring Time, And see it needs oil !!,
So you top the oil up and start the bike, Then the extra oil in the sump is pumped back in the oil tank and it overflows !! All over the Engine, We have all done it at some time ??.
It is a dry sump engine but you will always have a bit in there,
There is a drain plug that you can get to via a hole in the front footrest plate,
Below the Chain case.
The thing is if your oil is just above the bar you can see through the oil cap now !!,
And you remember, If it's below that next Spring , It has wet sumped , Sorry I have gone on TOO much.
Good Luck.
N, you can’t go into too much detail for me. When I bought my Vincent a few months ago I knew absolutely nothing about them albeit I have had many bikes over the years but mainly competition, speedway, trials, grasstrack and a H*nda CBR road bike. I’m learning fast with the Vincent with everyone’s help and a few books. I don’t mind asking the questions if you don’t mind answering them.
 

vibrac

Well Known and Active Website User
VOC Member
I put a new barrel piston and head on the electric foot Comet earlier in the Autumn but I havent filled the UFM with oil yet (and I had drained the sump at the start) It still manages to drop some oil on the floor as it waits like me for a couple of jabs (me on the arm Comet on the starter button ) I would be worried if the floor was dry!
 

Marcus Bowden

Well Known and Active Website User
VOC Member
Visit Neville Higgins and he places a very shallow S/S tray just fitting between the wheels and about 2' wide, I was on the "A" and he gave me an extra Gallon of oil to get myself home as leaking so much from the front cam bush.
Great fun visiting friends & members on the route and giving my self-material to write up in MPH but it was very nice to receive an email from Bob Stafford congratulating me for doing it as it showed, he said that they are capable of such journies as he did it several times to Germany when stationed there.

NEVILLE & VERA
IMGA0727.jpeg

WHAT A DRIP TRAY !
IMGA0698.jpg

PARKED WAITING FOR THE OVERBOOKED FERRY AT HOOK OF HOLLAND AND I HAD THE HOSPITAL BED TO SLEEP IN. ARRIVING EARLY MORNING AT HARIDGE
IMGA0748.jpg
VISITED ANGELA & LEN MATHEWS FOR A CUP OF COFFEE THINKING I WAS TO FOLLOW THEM TO THE AGM BUT THEY WEREN'T GOING SO RODE ON IN POURING RAIN ATTENDED MEETING AND LEFT EARLY TO LEAVE BIKE WITH ROBIN BLACKWELL AS CATCHING FERRY AT PORTSMOUTH

IMGA0753.jpg
TO LE-HAVRE RETURNING GRANDCHILDREN TO CAMITA & NICK. HAVEING ANOTHER FRENCH MEAL AS I MISSED OUT ON THE AGM EVENING.
P1000367.jpg
 
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peter holmes

Well Known and Active Website User
VOC Member
I think as far as retaining oil goes designing vertically split crankcases is somewhat optimistic, not to mention all the other possibilities for oil loss, I think the Japanese latched onto this fairly quickly with the horizontally split crankcase Honda CB72-77 series. Take a look at the parking arrangements at most big Vincent rallies, Isle of Man 1999, Italy 95, Belgium 99, I felt real sympathy for the hotel owners. When attending the West Bay Rally we normally visit my brother in law in Burton Bradstock, although he doesn't actually know my exact time of arrival he is normally in place, ready to greet us on his driveway with various oil drip catching devices, and my bike is pretty good by comparison to others that I have seen.
 

Bill Thomas

Well Known and Active Website User
VOC Member
The good old days in the IOM, When you could stay with anybody with a spare room,
And lean your Bike on there wall, Dear old Mrs Taylor !.
Not sure that's all my OIL !!.

Thanks to Howard for the photo.
 

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Bill Thomas

Well Known and Active Website User
VOC Member
Simon says, There is no such thing as a standard, Honda, Norton, "C" "D" or what ever it is :D ,
I only took that seat off my road l/ning a few months ago,
And fitted a standard "C" seat, Not sure I have done the right thing ?,
My tender BOT found the Honda one a Lot softer !, We shall see,

Funny I threw the Honda one away years ago and Ron picked it up and stored it,
I was looking for another seat some years ago and when I was down in Devon , He offered it back !!.
I had a "D" seat on it at the time.
never stop playing !!.
 

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