Step by step walk through adjusting the valve clearances on an airhead. This is a 1984 R65LS but the technique applies to most of the BMW boxer twins www.classicairheads.com
Great video, thanks! regarding valve clearance it has been recommended by BMW (in 1984) to increase the valve gap slightly. You'll want 0,1mm on the intake and 0,2mm on the exhaust. You'll get slightly noisier valves but it has other benefits.
Well explained, sir. I have one question: many people torque the stud nuts to 39Nm or even 40Nm (incremental, of course). My manual says, 35Nm. Why this difference? Also, intake valve gap is 0.15mm for the first 1000km. Only after 100km should be 0,10mm. Is this only for the situations with new cylinders? I have only resealed my cylinders and don t know how to choose these values
Whenever one piston is at tdc on the compression stroke the other is at tdc on the exhaust stroke. The one you want to adjust is the compression one because both valves will be closed. Then you turn the engine over so the other one is at tdc compression and adjust those clearances.
@@frederikvolkers8319 I am reading the manual which is opposite to this guy. Manual saying "If in doubt turn the engine over until the inlet valve on either cylinder has opened and closed again turn the engine slowly until the tdc mark appears.
Well explained, clearly shown instruction on the airhead valve adjustment. The best I’ve seen on UA-cam. We’ll done, sir!
Great video, thanks! regarding valve clearance it has been recommended by BMW (in 1984) to increase the valve gap slightly. You'll want 0,1mm on the intake and 0,2mm on the exhaust. You'll get slightly noisier valves but it has other benefits.
Many thanks ... you answered my question about rocker arm tolerance between the posts 🙂
Great video explained very thoroughly nice one 👍
Thanks, nice and clear.
very concise.
4 and 6
Well explained, sir. I have one question: many people torque the stud nuts to 39Nm or even 40Nm (incremental, of course). My manual says, 35Nm. Why this difference? Also, intake valve gap is 0.15mm for the first 1000km. Only after 100km should be 0,10mm. Is this only for the situations with new cylinders? I have only resealed my cylinders and don t know how to choose these values
At 2:40 the right cylinder is at compression stroke tdc as the manual said. I am so confused now
no it s not. He explaines it very good, just pay attention. In order to compress the fuel/air mix, both valves need to be closed.
How often do you perform this adjustment ?
Great vid! at 11:27 you say tdc on the exhaust stroke? isnt it on the intake stroke?
Whenever one piston is at tdc on the compression stroke the other is at tdc on the exhaust stroke. The one you want to adjust is the compression one because both valves will be closed. Then you turn the engine over so the other one is at tdc compression and adjust those clearances.
gfp motorrad ahh cool, isnt it the same on the intake stroke ? :)
@@frederikvolkers8319 I am reading the manual which is opposite to this guy. Manual saying "If in doubt turn the engine over until the inlet valve on either cylinder has opened and closed again turn the engine slowly until the tdc mark appears.
@@jesushairstyle this is exactly what he said. After you see the valves moving, you rotate the wheel until you see the OT mark.