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2016 street twin oil leak

5K views 13 replies 6 participants last post by  Salavers 
#1 ·
I have an oil leak in the head area of my 2016 street twin. I think the bike got hot on a traffic jam even with the cooling fan running. I would like to know if anybody has had this problem, It shows signs of cooland leaking on the right front frame tube. I noticed a coolant cap under my gas tank. Is there a factory maintenance manual available for the Street Twin or does anybody has a manual available ? My bike has 750miles on the clock. I thought that being liquid cooled it would be able to handle a traffic jam no problem. All help appreciated.
Juan
 
#3 ·
Hola Forchetto
Thank you for the information. my bike got hot in traffic and it must have overheated. It pumped oil out of the top of the engine under the tank and leaked coolant out of the top also. I was in a traffic jam and down here is a violation to split lanes my bike got hot and the fan came on I thought everything was fine. When I got home I parked my bike on my hydraulic work table. I didnt use it for a couple of days. I decided to move it from the table to work on one of my other bikes that`s when I noticed oil under the bike. I used a flaslight to see where it was coming from and it was from the top of the engine. I even had oil on the fuel line going from the pump to the fuel injector. I called the local dealer and I`m waiting for an appointmet,they said they will send one of their employees to pic it up in a truck. I can`t understand it how the bike got so hot if it has liquid cooling and a fan. I guess something is wrong or the cooling is not adequate.
 
#7 · (Edited)
Ah ha, it's coming from the cam cover and the seal it looks like. The oil is kind of oozing out lightly but pooling a bit and then dripping a bit. So this is a common occurrence?
It is on the air-cooled twins. At one time you couldn't move on the forum due to all the threads about cam cover leaks, flattened bolt seals, stripped threads from overtightening, etc...:)

The fixing method and components appear to be very similar, a rubber gasket held down by four shoulder bolts with a washer/seal on them and tightened to 14Nm. The pressure is applied by the washer/seal rather than the bolt, which is a shoulder bolt and can only be tightened down until the shoulder bottoms in the cylinder head casting.

The main problem with the leaks was due to the washer/seals being gradually flattened by heat and bolt pressure and so they stopped applying sufficient pressure on the cam cover and its gasket, like this:



A quick bit of research reveals that the bolt seals are part number T1260309. The same ones used on the air cooled bikes. Curiously enough those seals were then changed, to improve sealing properties, for part number T1260337 which are made of a better material that doesn't crush so easily.

Maybe they still have a skipful of the older washers and decided to use them on the new models so we can look forward to more fun and games with those...:)

Images of both. The new twins have the one on the left:

 
#10 ·
Better tell them to replace those and NOT over-tighten. On the old bikes, while the leak came from the gasket, there was nothing wrong with it and the solution was the bolt/button seals because the old ones didn't provide enough pressure. So..., save yourself some grief.
 
#11 ·
Hi Everyone,

I'm new to the forum so if I've posted this in the wrong section, I do apologize and hope that you will point me in the right direction.

I bought a salvage 2016 Triumph street twin in the hopes of restoring it and riding it. I was able to find a good specimen with minimal damage and had it restored.

Fast forward a few months, and it was up and running well for a few months, when the trouble started.

It seems to have developed an oil leak, the cause and location of which have become a topic of debate between the mechanics and me.

There seem to be two theories:

1. (The expensive theory) There is a crack somewhere in the crankcase which is causing the leak and needs to be replaced, or get an engine off ebay.

2. ( The quick fix, and the one which I think is more likely) Some seal or O ring needs to be replaced.

At this point I don't know whether the mechanics are simply incompetent or are trying to fleece me again. I say 'again' as I've taken it in thrice now for the same issue. The first time the starter motor O ring was replaced. The second time this happened, apparently a tiny crack was welded (I'm not sure it was there to begin with). The third time around, the starter motor O ring was replaced again. The leak has appeared again from the same spot and I've just had enough. I'm hoping one of you guys will be able to point me in the right direction. I've attached pics so that you might have a clearer picture of what I'm talking about.

Thanks
 

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