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235/261 Crankshaft
#4385 Fri Mar 25 2005 07:15 PM
Joined: Jan 2004
Posts: 222
N
Shop Shark
This may be a dumb question, but are these cranks interchangable? Is is just bore difference between these engines or stroke as well? Are the rod journals on the crank different diamaters? The reason I ask is I bought a 261 with a claim of recent rebuild. Had been ran since and was aware of "rumbling" noise. Pulled the head and pan. Haven't torn down completely yet. Everything looks good and like it was recently rebuilt but extremely excessive clearance rod to crank on every single cylinder. More than wear could accomplish or wrong bearings. (You can move every rod back and forth by hand.) Any possibility of someone using wrong crank?
Thanks in Advance,
Steve O.


1950 Chevy 3100
261, 4 speed
Purchased 1977

1964 Pontiac Lemans Convert
Re: 235/261 Crankshaft
#4386 Fri Mar 25 2005 08:23 PM
Joined: Sep 2001
Posts: 30,165
ace skiver
Nifty 50,

The 1953 CHEVROLET SERVICE NEWS states with regards to the the new 1954 261 cu. in. Heavy Duty Engine "The same stiffer structure crankshaft of the regular 1954 truck engine [235 cu. in.] is used, providing the same 3 15/16 inch stroke." and later "The connecting rods (on the 261), which have larger sections for increased rigidity and strength [than those used on the 235], retain the same 27 degree oil jet hole for cylinder wall lubrication and use identical insert-type big end bearing and rod caps as the regular production engines."

Tim


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 235/261 Crankshaft
#4387 Fri Mar 25 2005 09:13 PM
Joined: Jan 2004
Posts: 222
N
Shop Shark
Thank Tim, then I have to change my thinking, maybe a too agressive gring on the crank journal and wrong sized bearings.


1950 Chevy 3100
261, 4 speed
Purchased 1977

1964 Pontiac Lemans Convert
Re: 235/261 Crankshaft
#4388 Sat Mar 26 2005 03:50 AM
Joined: Nov 2000
Posts: 582
4
Shop Shark
From what I've read from previous posts, the cranks are the same, the rods are heavier.


Country Roads, West (By God) Virginia
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