65 with a possible intake problem

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old1955
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65 with a possible intake problem

#1

Post by old1955 » Sat Jan 03, 2009 4:35 am

Well, about to do this 3500 mile round trip with three mates and I decided to tear her (65) down and check most things as
I hate maintenance on the runs. (gas a go, maybe the chain if you have too.)

So she's back together now but haven't started her yet. Then I noticed something!
I have a rag in the carby as we have mud wasps, who like dark cool place to build their muddy nests. I gently kicked her over
after adjusting the the solids and "The Rag" flew out of the S&S - E carbys mouth. Oops! that's not good !

Then I got to thinking, is it the cam in the wrong place? No, I didn't remove it, but for some reason I didn't check the timing marks while I was in there
it was running fine before. I had to remove the side cover to fix a crack in it.

Then I thought....... is it cam overlap maybe? Not sure about that! (Andrews ' B' grind)

I slacked off the inlet push rods to the point where they were just loose, still happened.
Valves don't seem to be stuck open. I don't want to remove the side cover again, but if I have too! Shit!

Some other thoughts on this would be great, many thanks,
Pete
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Panacea
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Re: 65 with a possible intake problem

#2

Post by Panacea » Sat Jan 03, 2009 6:48 am

I'm not sure about the intake timing on the "B" cam, but I believe the intake valve opens before top dead center which could be enough to blow the rag out if the exhaust were closed...Mike

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Re: 65 with a possible intake problem

#3

Post by steve_wood » Sat Jan 03, 2009 1:11 pm

The dog seems to think it might be an oil pump problem!

Sorry, couldn't resist.

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Re: 65 with a possible intake problem

#4

Post by john HD » Sat Jan 03, 2009 1:59 pm

i thought he was looking at the voltage regulator!

john :D

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Re: 65 with a possible intake problem

#5

Post by FlatHeadSix » Sat Jan 03, 2009 3:26 pm

Mike
Even if the "B" grind is opening the intake a few degrees before TDC there should be no pressure in the cylinder if the exhaust valve was opening and closing when it should. I would suspect a sticking exhaust valve or exhaust valve push rods that were set too loose or some variation of the two factors.

Pete,
Did it ever "sneeze" through the carb during cold start kicking before you tore it apart?

mike

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Re: 65 with a possible intake problem

#6

Post by Panacea » Sat Jan 03, 2009 3:32 pm

Was the rag followed by a puff of smoke? Mike

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Re: 65 with a possible intake problem

#7

Post by old1955 » Sun Jan 04, 2009 12:40 am

G' day Guys,
thanks for your thoughts.

Steve that' s my technical adviser you see in the shot

Mike (Flatheadsix) No sneezing that I can remember. I hate a back-fire through the carby, It can char-grill those foam air cleaners.
The steel (unknown) push rods are adjusted to " a slight drag between the thumb and first finger. (technical stuff)"

Mike (Panacea) Not a puff in sight when it was running before.

Can anyone ID the push rod? The quality is high but the adjusters are a pain in the butt, to high up in the tube.
dscf0088.jpg
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Re: 65 with a possible intake problem

#8

Post by mbskeam » Sun Jan 04, 2009 8:20 pm

looks almost like my twincam pushrods.... :D :D :D
they are andrews
maybe a custom job, you get the tubes and ends, then you cut the tube to size and push in the ends


mbskeam

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Re: 65 with a possible intake problem

#9

Post by Panacea » Sun Jan 04, 2009 11:36 pm

I've also got a set of adjustables in my twincam, (Screamin' Eagle) they come with a new set of tubes that allow greater access to the adjusters. Still have to be really carefull not to screw up the threads or they won't adjust easily...Mike

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Re: 65 with a possible intake problem

#10

Post by mbskeam » Mon Jan 05, 2009 3:02 am

naw...
I left the old covers on....
I'm cheap that way....LOL
it isn't like ya have to adjust them all the time..... :wink: :wink:

mbskeam

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Re: 65 with a possible intake problem

#11

Post by 58flh » Fri Jan 23, 2015 2:10 pm

TheP-rods are nice.-You set them correctly.The olny thing compromised was a carb. change-Pressure test the manifold using Cottons Simple check!.What your expierncing is all to common.Once the leaks are fixed You have a nice-runner with the solids!--Heck they were meant to run solids to me.Fire-up & Adj. carb. to engine OLNY after no VACUUM leaks.That is a nice 65-----Respectfly--Richie

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Re: 65 with a possible intake problem

#12

Post by RUBONE » Fri Jan 23, 2015 2:42 pm

The spit back through the carb is normal and they all do it. Some combos of cams make it more or less pronounced. You are effectively choking it with that rag. If you don't want it to spit it out don't put it in there.... :mrgreen:

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