rotate the engine less1 shim?

[mvalenti]

Can i rotate the engine with a shim removed? I want to swap#1 exhaust for #4 intake..

[Larry D]

No !!!!!!!!!!!!!

[hampshirehog]

Don't do it. Pop a coin in there that is the same size and you can get away with it - carefully (turn by hand, not the starter).

[tas850g]

what are the ramifications if one does this? Cam Lobe gets scratched?

[Steve]

No !!!!!!!!!!!!!

What he said, except with a little more emphasis.


NO!!!


For some entertaining light reading click HERE to see a recent thread.

.

[mvalenti]

Lol, thanks..
I measured clearances agIn and recorded shim sizes here is what i got..
(Cyl) measurement/shim

Intake:
(1) 0.002/2.70
(2) 0.002/2.70
(3) 0.0015/2.75
(4) 0.0025/2.65

Exhaust
(1) tight/2.75 and kinda blue in the center (will post pic)
(2) 0.0015/2.75
(3) tight/2.65
(4) 0.0015/2.65

[MisterCinders]

Lol, thanks..
I measured clearances agIn and recorded shim sizes here is what i got..
(Cyl) measurement/shim

Intake:
(1) 0.002/2.70
(2) 0.002/2.70
(3) 0.0015/2.75
(4) 0.0025/2.65

Exhaust
(1) tight/2.75 and kinda blue in the center (will post pic)
(2) 0.0015/2.75
(3) tight/2.65
(4) 0.0015/2.65

Are those clearances in mm? If so, you have too many zeroes.

Adjusting for that, you are way tight. You also don't have many swaps at hand to adjust them.

Also, did you measure the shims with a caliper/micrometer? If you are working from the printed thickness, you should measure the shims yourself. The shims often don't match their nominal thickness.

You might be able to swap some of the 2.65 shims into the 2.70 and 2.75 buckets to open up those clearances, but you need at least three more shims for the job.

[AJ]

Just another reason I like the 16V motors with the screw adjusters. Those shims are a pain in the @zz.

(The upside is you don't have to pull the cams like on my Bus )

[mvalenti]

I used a feeler Gage to measure gap, in inches. .00015, .002,.0025,.003 etc.. I have a good micrometer I can use to measure the shims. I took them at face value. Also I thought (per the gs manual) 0.001-0.003 was the target clearance, no? See the bluing on the shim? Excessive heat?

-mark

[mrbill5491]

Hmmm, from what I can tell from the bluing on the shim it doesn't look like heat bluing. Heat bluing will have different shades associated with it not one color you have in the pic.

[hampshirehog]

See the bluing on the shim? Excessive heat?

A lot of them come much more blue than that from the factory - nothing to worry about.

[MisterCinders]

I used a feeler Gage to measure gap, in inches. .00015, .002,.0025,.003 etc.. I have a good micrometer I can use to measure the shims. I took them at face value. Also I thought (per the gs manual) 0.001-0.003 was the target clearance, no? See the bluing on the shim? Excessive heat?

-mark

My GS750 manual has the clearances in metric (0.03mm - 0.08mm). Dunno what they translate to in SAE.

OK - the Interwebs tell me that the clearance range is 0.001181 to 0.003149. Of course, you'll need to do even more math to figure out what shims you need . . .

[mvalenti]

Thanks guys on the bluing,scared me a bit.. cinders, are those longish numbers inches?
.001-.003 in = .0245mm-.0762mm. Got some figuring to do from here....

[Steve]

Of course, you'll need to do even more math to figure out what shims you need . . .

No, he doesn't. Read my sig.

.

[mvalenti]

Lol, steve does that spreadsheet help when i cant get a feeler gage in there?