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Re: 235 Exhaust manifold replacement
Oldtruckspapa #1331707 Tue Oct 29 2019 03:32 AM
Joined: Jun 2011
Posts: 4,234
E
'Bolter
Gentle heating, tapping shaft endwise, oil while cooling would be a start.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 235 Exhaust manifold replacement
Oldtruckspapa #1331746 Tue Oct 29 2019 02:45 PM
Joined: Jun 2010
Posts: 159
D
'Bolter
I will be replacing my head soon and sounds like I should use the Rimflex gasket. Does anyone have the part number? (I apologize ahead of time if it is in the Tech Tips).

Re: 235 Exhaust manifold replacement
Oldtruckspapa #1331754 Tue Oct 29 2019 03:33 PM
Joined: Jan 2000
Posts: 2,156
J
'Bolter
I got my last Remflex for the 235 at Summit for a good price. That gasket was the cure for an old Clifford intake I had that didn't fit for spit.

https://www.summitracing.com/parts/rfl-2027/overview/

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Last edited by JiMerit Boltr#43; Tue Oct 29 2019 03:38 PM.

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Re: 235 Exhaust manifold replacement
Oldtruckspapa #1331772 Tue Oct 29 2019 05:04 PM
Joined: Jan 2017
Posts: 431
4
'Bolter
ED--I would add the use of PB blaster to aid in getting the flapper unstuck..Bill

Re: 235 Exhaust manifold replacement
Oldtruckspapa #1335375 Tue Nov 26 2019 10:05 PM
Joined: Jun 2010
Posts: 159
D
'Bolter
JiMerit - thank you (belated) for the link to the Rimflex gasket.

Re: 235 Exhaust manifold replacement
Oldtruckspapa #1335378 Tue Nov 26 2019 10:20 PM
Joined: Feb 2004
Posts: 23,018
H
'Bolter
Frozen up heat riser valves are a common problem, and they're usually pretty simple to fix. Heat from a Propane or Acetyline torch ,penetrating oil, tapping the shaft side to side with a hammer, and lots of patience will usually free up the shaft. Soak, heat, tap, repeat- - - - - - -over and over. Once it breaks free be sure the flap can move through its full travel, install a new thermal spring, and press on. The thermal spring on Ebay advertised for a Jeep is less than half price of the outrageously expensive OEM style ones the resto-ripoff places sell.
Jerry


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The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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