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Re: Horrible Sound from my 261
Wally / Montana #1373706 Mon Aug 17 2020 12:24 AM
Joined: Sep 2001
Posts: 30,471
ace skiver
Originally Posted by Wally / Montana
Can a bad hydraulic lifter make that noise? . . .
Unless it is a Canadian Pontiac 261, it would have mechanical lifters (unless someone changed to hydraulic lifters)?

So we know what we/you are working with, what is the Engine Serial number (stamped into the ledge in the block at the rear of the distributor)?


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: Horrible Sound from my 261
Wally / Montana #1373719 Mon Aug 17 2020 01:58 AM
Joined: May 2001
Posts: 1,532
W
Shop Shark
Tim, No number stamped on the flat to the rear of the distributor. Clean and smooth. I always thought that meant it was a replacement engine from the factory. I've seen numbers stamped there on other engines, like my previous 235, but there's nothing on this 261.

The number cast into the block is 3769925. A241 (Jan 24, 1961?) also cast.

When I put the final touches to what the engine guy rebuilt in 2004, I put in hydraulic lifters. This was 16 years ago and I'm remembering the block being drilled for hydraulics. Me? Remember??

Tim, perhaps I should offer the prize in the picture for the correct answer to my problem noise.

Attached Files
George Dickel.JPG (47.67 KB, 184 downloads)
Last edited by Wally / Montana; Mon Aug 17 2020 01:58 AM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373723 Mon Aug 17 2020 02:38 AM
Joined: Sep 2001
Posts: 30,471
ace skiver
I just had my pre-sleep shot of George Dickel.

Find & Post here the following codes: [1954advance-design.com]
Head casting code
Head date casting code
Block casting code
Block date casting code

We will then be somewhat certain on the head and the block that you are working on?


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: Horrible Sound from my 261
Wally / Montana #1373732 Mon Aug 17 2020 03:42 AM
Joined: Jan 2001
Posts: 5,024
P
Master Gabster
Ed, I think for a noise test you could put some grease or maybe 90w on the gears and test run it.
I think the noise will go away.


See the USA in your vintage Chevrolet!
My Blog
Re: Horrible Sound from my 261
Wally / Montana #1373733 Mon Aug 17 2020 03:43 AM
Joined: Mar 2010
Posts: 9,446
5
Master Gabster
Check to make sure that the bolts which hold the camshaft thrust plate to the block are in place. If they are missing, I would suspect it would make a noise like that as the flange if that bearing was free-spinning.
You access them through the holes in the camshaft. You will need to manually turn the engine over until the holes line up with the bots. I believe that they take a large Phillips head screwdriver.

Last edited by 52Carl; Mon Aug 17 2020 03:46 AM.
Re: Horrible Sound from my 261
Wally / Montana #1373758 Mon Aug 17 2020 02:07 PM
Joined: May 2001
Posts: 1,532
W
Shop Shark
To summarize:

Block: 3769925 A241 (Jan 24, 1961)
Head: 3836848 C40 (Mar 4, 1960. The holes were drilled in this 848 head.)

I take a considerable amount of time thinking before doing anything.


1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373771 Mon Aug 17 2020 03:14 PM
Joined: Feb 2004
Posts: 21,047
H
Boltergeist
I would have dropped that front main bearing cap and inspected the bearing about two weeks ago!
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: Horrible Sound from my 261
Wally / Montana #1373789 Mon Aug 17 2020 04:56 PM
Joined: May 2001
Posts: 1,532
W
Shop Shark
A lot of my time is spent floating flies on the Clark Fork, Bitterroot and Blackfoot Rivers and another not-to-be-named stream. They are all within a few miles of my house. When the going gets tough, the tough go fishing, right?

Thanks everyone. More on the truck later.

Last edited by Wally / Montana; Mon Aug 17 2020 04:56 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373795 Mon Aug 17 2020 05:35 PM
Joined: Feb 2004
Posts: 21,047
H
Boltergeist
I hear garden hackle works well on streams like that! Dead drift from a spinning rod!
LOL!
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: Horrible Sound from my 261
Wally / Montana #1373810 Mon Aug 17 2020 06:20 PM
Joined: Mar 2014
Posts: 1,665
J
Shop Shark
I caught 4 rainbow and 1 brown trout on 2 different mornings week before last in NM. We pan fried them along with some potatoes, added some broccoli, fresh lemon, ketchup and had two meals fit for a king. Caught 3 on worms and 1 on cheese from the bridge at the south end of our property.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
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