backside method -- is this right?

[Hnichols]

Hi everybody,
Starting my first valve adj. I'm using the traditional method (at least for the exhaust valves where I can see what I'm doing!). But I'd like to check with the backside method.

So I'm trying to figure out where you insert the feeler gauge: it's from the bottom (exhaust side) to check the intakes, and vice versa, right? Can anyone confirm that I'm doing it right from the photo below? Taken from underneath the car on cyl. #1 -- trying to check the intake valve for that cylinder.

I think I'm right, but even a 0.020" feeler gauge doesn't go, so either my valves are way too tight, or I'm doing something wrong.



Thanks in advance!
Hugh

[Canada Kev]

Yes, exhaust side to check intakes and vice versa (thus, backside method).

From your pic on my fone, I can't see much, but if a .002 won't fit, I'd ensure you have the crank set in the correct position so that cylinder's valves are closed. If the .004 gauge fits under the elephant foot, you are probably doing the backside measurement incorrectly.

[john walker's workshop]

way to confuse yourself on your first valve adjustment. stick to the conventional method until you get used to the procedure and get good results.

[Ronnie's.930]

Originally Posted by Hnichols

I think I'm right, but even a 0.020" feeler gauge doesn't go, so either my valves are way too tight, or I'm doing something wrong.Thanks in advance! Hugh

The problem is you are using the wrong feeler gauge (much too thick) - you probably meant to use .002 rather than .020.

.0025 = go
.003 = no go

[Hnichols]

Originally Posted by Ronnie's.930

The problem is you are using the wrong feeler gauge (much too thick) - you probably meant to use .002 rather than .020.

.0025 = go
.003 = no go

Well, that explains it! (I feel like an idiot.)

John: I respect your point about sticking to the traditional method. But I figured there would be no harm done using the backside method (1) to check if the intakes need any adjustment at all, so that I don't mess with a valve if it's already correctly adjusted; and (2) to confirm, as a backup check, the adjustments that I do make using the traditional method. My goal is not to save time, but rather to avoid having to do it again after I put everything back together.

Thanks all!

[Ronnie's.930]

No need to feel like an idiot - that's an easy mistake to make if you are not very experienced with using fine measuring instruments and such.

BTW: I use the backside method and prefer it greatly (have always used a "go-no go" technique with Ducati engines so it is second nature to me).