Hello everyone.
Today I show how I removed the crankcase pressure control valve (T-REV) from my G650GS. I removed it to return the bike to standard before I sold it.
I wrote about fitting the T-REV in an earlier post.
Let's get started.
I had already taken off the bodywork. The T-REV was fitted where the yellow arrow points in the photo below.
The T-REV is aluminium, and all I needed was for the breather hose not to come off, so I had secured the hose with cable ties.
This is the breather hose on the crankcase side.
Cut the cable ties and it comes off.
The breather hose screws into the airbox.
The hose on the left is the original. I didn't want to cut the original hose to fit the T-REV, so I used a separate oil- and heat-resistant hose.
I had fixed the breather hose onto the hollow bolt with a hose clamp.
This is the hollow bolt I used. It is a POSH spare indicator (turn signal) stay bolt, M8 × 30 mm, with the head cut off.
Perhaps because the cable ties had left marks in the hose, the T-REV pulled out without even cutting the ties.
Looking at the removed T-REV, there was emulsion on it (oil and water mixed into a mayonnaise-like paste).
And this was only about six months after I had overhauled it with the overhaul kit.
The T-REV really is a part that needs regular cleaning.
This should have been the hardest part of the job, but with the special tool it was over in no time.
The breather hose is held to the crankcase by a clip called a Clic R. It seems they are sometimes used on European bikes.
The shape of this clip is unusual, so it is fiddly to remove and refit, but with the special tool it was over in no time.
As in the photo above, you just grip it with the special pliers to fit it.
Then I took the bike for a test ride without the pressure control valve.
This is just my personal impression, but this is how it felt:
- The engine's pulses felt rougher
- The combustion felt harsher, with sharper edges
- It was jerkier at low speed.
I still think a crankcase pressure control valve is a very useful part for a motorcycle.
My T-REV series on the BMW G650GS:
- Review: how the T-REV changed my G650GS
- Fitting the T-REV
- Maintenance part 1: taking it apart
- Maintenance part 2: full overhaul
- Removing the T-REV and riding without it (this post)