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Re: Rochester Question
NorthCoast3800 #1374813 Tue Aug 25 2020 07:43 PM
Joined: Mar 2020
Posts: 76
N
Shop Shark
Thanks Doc Hall; yup mine was a little sticky but actually popped out with no issues. I have scrubbed r' out with a bronze bore brush.

Accelerator pump is squirting well. The "umbrella" is still soft.

Believe the issue (as with many running issues) wasn't the ole' Rochester at all but simply this severe intake (vacuum) leak. I'll be able to try it out later this afternoon and if she leaks again I'll have to turn some adapter rings on the lathe, it has the small port intake and large port heads so it's kind of floating around.


1949 Chevrolet 3/4 Ton - Still Solid.
Re: Rochester Question
Doc.Hall #1374827 Tue Aug 25 2020 08:41 PM
Joined: Jun 2004
Posts: 8,219
W
Master Gabster
Originally Posted by Doc.Hall
As is the usual case with this site you are receiving quality information. I'm Known as the Rochester B, BC & BV Nazi in my local area. Something that many miss on the rebuild is the power piston. once you take the air horn (top of carb., four screws), check the power piston, this is the tube that looks like a ball point brass refill. Very carefully pull it out, if is hard to move soak well wth Krol oil or Blaster etc. NEVER WD-40 (it will crystallize under heat). Twist very gently and pull base with needle nose pliers. You do not want to break it, it cannot be ordered. there is a small spring under it so don't loose it either. I always polish the chamber and stem with a small round gun brush. This has to move up and down, if it is not free it can cause all kinds of problems. Also be sure the the accelerator pump is not sticking and is clean, gently brush out the well and put the right number of balls in the well pending carb casting. Doc

These are very good points. Also make sure the piston goes in the hole & knocks the ball off its seat. Often it is bent or the holder is not aligned good & the piston rod does not go in the hole.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Rochester Question
NorthCoast3800 #1374853 Wed Aug 26 2020 12:06 AM
Joined: Mar 2020
Posts: 76
N
Shop Shark
Great info folks, I appreciate it.

I got it running and it actually ran really well with the new intake gasket, purred like a kitten. Doesn't even seem to smoke. Unfortunately, as it got hot the intake started leaking again (for the reasons I learned in this thread - 49 intake, small ports on a 57 head with big ports, and only the small rings just floating around).

So I'll be machining new adapter rings for this mismatched unit and ordering those better gaskets.

I'd call this "solved" at least. I'm glad to know the challenge and deal with it.


1949 Chevrolet 3/4 Ton - Still Solid.
Re: Rochester Question
NorthCoast3800 #1374863 Wed Aug 26 2020 01:51 AM
Joined: Feb 2001
Posts: 1,133
D
Shop Shark
I mounted a 216 manifold to a 235 head and made some stepped rims to fix the mismatch . pic attached for you .

Attached Files
DSCF3113.JPG (152.08 KB, 83 downloads)
Re: Rochester Question
NorthCoast3800 #1374905 Wed Aug 26 2020 01:39 PM
Joined: Jan 2020
Posts: 489
D
Shop Shark
Dusty, are those made of steel or stainless. That is terrific looking and great idea. Ed


Currently making 1954 3100 better than new
Re: Rochester Question
NorthCoast3800 #1374921 Wed Aug 26 2020 04:28 PM
Joined: Mar 2020
Posts: 76
N
Shop Shark
Thanks Dusty. Another good option to consider.

On the material side, I was just going to use mild steel pipe. I'll second DocHall's question, what did you use?

The factory rings develop surface rust pretty quick in the elements so I presume they are just high carbon steel, needed to make them act like springs to take up the slack in tolerances from engine to engine. I could pick up some stainless but it's pricey. Hoping to start turning these this afternoon.

I'll start a new thread on that for discussion after I get them done.

Last edited by NorthCoast3800; Wed Aug 26 2020 04:56 PM.

1949 Chevrolet 3/4 Ton - Still Solid.
Re: Rochester Question
NorthCoast3800 #1374947 Wed Aug 26 2020 07:01 PM
Joined: Feb 2001
Posts: 1,133
D
Shop Shark
The rings are just mild steel . nothing fancy , they look good 'cause I just machined them LOL. Snug fit in the head , all's good .

Re: Rochester Question
NorthCoast3800 #1374955 Wed Aug 26 2020 08:57 PM
Joined: Mar 2020
Posts: 76
N
Shop Shark
PERFECT that was my feeling too. Thanks!

Update: Got the rings machined; ended up sort of following Dusty's lead they are simply a bushing in the head. Just waiting for the Remflex gasket to show up now.

Attached Files
235 INtake Rings 1.jpg (6.71 KB, 11 downloads)
235 INtake Rings 2.jpg (17.38 KB, 12 downloads)
Last edited by NorthCoast3800; Thu Aug 27 2020 09:17 PM.

1949 Chevrolet 3/4 Ton - Still Solid.
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