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Re: Gathering info re 848 head cracks [Re: tom moore] #1290106
Thu Dec 06 2018 08:16 PM
Thu Dec 06 2018 08:16 PM
S
sstock  Offline
Shop Shark
Joined: Jan 2013
Posts: 939
Gig Harbor, WA
About 35 years ago, I dropped a head off my 54 235, of course it was after I had picked it up from the machine shop (with its beautiful 3 angle valve job)and was taking it out of my truck and I slipped on some ice and decided to let the head go to save myself. Loaded it back up and took it to the machine shop to have it checked. A few days later the machinist called me and told me to come pick it up, didn't hurt a thing, must of just landed right.


1953 Chevrolet 3100
Re: Gathering info re 848 head cracks [Re: tom moore] #1290107
Thu Dec 06 2018 08:17 PM
Thu Dec 06 2018 08:17 PM
T
tom moore  Offline OP
Shop Shark
Joined: May 2006
Posts: 396
New Hampshire
Most people tell me I have a cracked head - but that's another topic.

Last edited by tom moore; Thu Dec 06 2018 08:17 PM.
Re: Gathering info re 848 head cracks [Re: tom moore] #1290111
Thu Dec 06 2018 08:37 PM
Thu Dec 06 2018 08:37 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 17,436
Dellrose, TN
A method of crack checking that's more effective than Magnaflux is pressure testing. All the water passage holes have plugs clamped over them and air pressure is applied to the head. A soap solution is then applied to the pressurized casting and any hidden leaks show up as foamy bubbles.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Gathering info re 848 head cracks [Re: tclederman] #1290125
Thu Dec 06 2018 10:31 PM
Thu Dec 06 2018 10:31 PM
S
Stove  Offline
Shop Shark
Joined: Jun 2008
Posts: 248
Saskatchewan, Canada
Originally Posted by tclederman
...Does anyone disagree regarding the 848 head being no more likely to crack compared to other low-pressure 235 and 216 heads (and, compared to 261 heads)?


I really wouldn't know, but "8 track dude" reports in the below thread that 848 heads have a higher nickel content to reduce cracking.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=11860&page=all

Re: Gathering info re 848 head cracks [Re: tom moore] #1290156
Fri Dec 07 2018 02:16 AM
Fri Dec 07 2018 02:16 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 7,512
Virginia
Trucks with these engines replaced horses. Many were treated like rented mules. Rode hard and put away wet. Leaky radiator? Too expensive to replace. Keep adding water if you remember to, or add bars leak until the radiator and water jackets are completely full of it. Overheating is not a friend of any heads. These trucks were all parked for a reason. I suspect overheating was the cause of many of them being parked.

Re: Gathering info re 848 head cracks [Re: tom moore] #1290212
Fri Dec 07 2018 07:02 PM
Fri Dec 07 2018 07:02 PM
tclederman  Online
Boltergeist
Joined: Sep 2001
Posts: 26,852
Jarvisburg, NC
Maybe the reason that many people find cracked 848 heads is that the parts-yard truck-engines were taken off the road because of a head crack (most likely caused by overheating)?

How many members have had a good 848 headed engine experience a cracked head after driving a good engine for 10,000 miles (and not have a cooling system overheat, that might have caused that bad head)?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 47 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: Gathering info re 848 head cracks [Re: tom moore] #1290248
Fri Dec 07 2018 10:53 PM
Fri Dec 07 2018 10:53 PM
W
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 7,908
Lenexa Ks.
Ive never had much trouble with cracked heads on the Stovebolt engines but the flathead Ford v-8 did. You seldom tore one down that didn't have a cracked valve seat. The exhaust went through the engine to the outlets.

George


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

1956 Chevy 1/2-Ton Pickup

Re: Gathering info re 848 head cracks [Re: tclederman] #1290272
Sat Dec 08 2018 01:19 AM
Sat Dec 08 2018 01:19 AM
5
55 SHAKER  Offline
Shop Shark
Joined: Dec 2008
Posts: 868
80 miles west of Joliet IL.


How many members have had a good 848 headed engine experience a cracked head after driving a good engine for 10,000 miles (and not have a cooling system overheat, that might have caused that bad head)?

[/quote]


I've put a 11 thousand miles on my 235 with a 848 head, with no problems. Have no history on the engine, so I really don't know how many miles are on it.


Brian
My 1955 Truck

My other 1955 Chevy

The older I get the more dangerous I am!!!!!
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