Spring has, errr sprung...

Dukedesmo · 22-03-2024, 11:43 AM

Out of my engine, unfortunately!

Decided to service the Monster today, oil change, new rear tyre etc. getting ready for the spring.

Dropped the oil and found this on my sump plug;

A couple of bits of thin spring, around 1mm thick, 34mm long, obviously from some kind of oil seal. Now the only seals with springs of this size are the valve guide oil seals, aftermarket (AV&V) rather than OEM as the OEM don't have springs.

Some may recall that I had to replace the gearbox on this back in 2021 and whilst in there found the valve guides to be worn so replaced them at the same time. Rebuilt with new valve guide oil seals but luckily (being a bit of a hoarder), I kept the old seals as they basically looked fine and you never know...

Anyway, a quick check with an old seal shows that this is indeed a valve guide seal spring as you can see from this pic showing a couple of seals, one with the spring removed;

So now I've got to dive into the valve covers to find which one is missing a spring. Hopefully the seal is still in place and I can simply slip a spare spring over the end also don't know why it broke, especially into 2 pieces maybe just a case of **** happens?

Wish me luck.

22-03-2024, 11:43 AM	#1
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,901	Spring has, errr sprung... Out of my engine, unfortunately! Decided to service the Monster today, oil change, new rear tyre etc. getting ready for the spring. Dropped the oil and found this on my sump plug; A couple of bits of thin spring, around 1mm thick, 34mm long, obviously from some kind of oil seal. Now the only seals with springs of this size are the valve guide oil seals, aftermarket (AV&V) rather than OEM as the OEM don't have springs. Some may recall that I had to replace the gearbox on this back in 2021 and whilst in there found the valve guides to be worn so replaced them at the same time. Rebuilt with new valve guide oil seals but luckily (being a bit of a hoarder), I kept the old seals as they basically looked fine and you never know... Anyway, a quick check with an old seal shows that this is indeed a valve guide seal spring as you can see from this pic showing a couple of seals, one with the spring removed; So now I've got to dive into the valve covers to find which one is missing a spring. Hopefully the seal is still in place and I can simply slip a spare spring over the end also don't know why it broke, especially into 2 pieces maybe just a case of **** happens? Wish me luck. __________________ M900, 916, LeMans II.