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Re: Low Oil Pressure ‘59 235
Phak1 #1371059 Tue Jul 28 2020 09:41 PM
Joined: Feb 2019
Posts: 846
P
Phak1 Offline OP
AD Addict
My hope is the block doesn’t need anything more than new bearing half’s and a crank re-grind. Gotta think positive!


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Low Oil Pressure ‘59 235
Phak1 #1371063 Tue Jul 28 2020 10:05 PM
Joined: Feb 2004
Posts: 21,064
H
Boltergeist
Most engine machinists who allegedly learned their trade in the past 20 years or so have a habit of building up stovebolt engines with tolerances that are way too tight- - - -particularly rod and main bearing oil clearances and valve guides. What we used to call "normal" clearances on those engines is "worn out" on the rice rockets they're accustomed to working on.
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: Low Oil Pressure ‘59 235
Phak1 #1371069 Tue Jul 28 2020 10:33 PM
Joined: Jun 2011
Posts: 3,633
E
Shop Shark
Make sure that whatever you take apart gets marked so it goes back exactly where it came from, same orientation.

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: Low Oil Pressure ‘59 235
Phak1 #1371074 Tue Jul 28 2020 11:13 PM
Joined: May 2005
Posts: 7,492
B
General Purpose
What exactly is the reason not to got to a newer 235 design? I keep forgetting why folks spend all this time and money and constant headache. I don't think I will ever understand the mental aspect of this decision. Just as there are very few to work on them, there are very few who know it's not a babbitt motor. It all looks pretty silly from my lofty position.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: Low Oil Pressure ‘59 235
Phak1 #1371077 Tue Jul 28 2020 11:22 PM
Joined: Feb 2004
Posts: 21,064
H
Boltergeist
"Reading is Fundamental"- - - - - a 59 engine is a "newer 235 design". Makes no difference- - - -the main bearing dimensions are all the same on 216, 235, and 261 engines.
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: Low Oil Pressure ‘59 235
Phak1 #1371102 Wed Jul 29 2020 02:19 AM
Joined: May 2005
Posts: 7,492
B
General Purpose
My comment was general about low pressure era and babbitt era motors. They seem to be more complex to get serviced/rebuilt. I will decline further comment. Two many toes here.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: Low Oil Pressure ‘59 235
Phak1 #1371117 Wed Jul 29 2020 05:56 AM
Joined: Jul 2014
Posts: 234
1
Shop Shark
The reason for the spun main bearing from the previous owner could well be that the main bores are out of line. But another could be that somebody ordered the wrong part number for the mains or the late bearings weren't available. Perhaps not knowing that they require shims he just put it together tight. Then having spun the bearing he shimmed it's replacement and not being familiar with the shims installed the whole pack. If they shimmed all of them like that it would have set up a heck of a racket aside from low oil pressure.

What I'm working around to is that the crank and the block might be OK. Usually, if a bearing is spun the journal will be really ugly and will need to be reground. I've forgotten if the OP said the engine was in the truck or not. But as HRL said it's a royal pain to pull the crank with the engine in the rig. What I would do, being both cheap and lazy, is to pull the suspect main cap and another and see it they are both stamped with the same undersize. If so, assemble them with plastigage torque it down and see what you get. Shim if you need to get the proper clearance. Once you get it assembled with the proper clearance, with the rods tucked up inside, you can rotate the crank. You won't be able to spin with abandon but you'll get enough rotation to see if it spins free (have the rear main seal out). If it turns free then the crank is straight and the main bores are OK. If not, well, look for another block or line bore that one. But before you go to that expense have the machinist make darn sure the crank is straight.

The shims are a tricky deal. I sent a set back to the vendor because I couldn't figure out how or if once could peel them apart. I salvaged the old ones instead. I'm not sure what years need to be shimmed and what don't but if it's too tight I don't see anything wrong with using the factory shims for an earlier motor. You might loose a little crush on the bearing shells but so did the shimmed early ones. I see that the lower halves are pinned so the bearings aren't going to spin on account of too little crush. You shouldn't have to shim much, maybe 0.002 tops. If you would have to shim a lot then the bearings don't match the crank grind. Set the rear main up on the tight side (but not too tight) to reduce oil leakage from the seal.

Hope this wasn't too confusing.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Low Oil Pressure ‘59 235
Phak1 #1371151 Wed Jul 29 2020 02:52 PM
Joined: Feb 2004
Posts: 21,064
H
Boltergeist
People have gotten far too complacent about checking and/or adjusting oil clearance because the machining and quality control of modern engines and bearings has gotten so good. If it doesn't fit right by simply bolting stuff together it must be junk- - - - - -throw it away and start over with a different engine. Any sort of skill or thinking ability isn't required for parts swappers- - - - -real mechanics are a dying breed!
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: Low Oil Pressure ‘59 235
Phak1 #1371162 Wed Jul 29 2020 03:33 PM
Joined: Aug 2018
Posts: 262
D
Shop Shark
Phil, I lived in the Albany-Schenectady area years ago. A couple of my brothers-in-law still live in the area, so I checked in to compare notes on machine shops. One sort-of stands out in our collective opinions, XLR8 Machine Shop [sites.google.com], in Cohoes. I used it 35 years ago for a 454 build when it was "Noel's," but since then it has changed ownership, but maintains high standards, according to what I hear. Steve Stack is the current owner. He has a vintage Perkins head and a 409 posted on his FB page, so he has familiarity with some vintage iron. You may want to chat with him and ask specifically about stovebolts.

Hope this helps.

Doug

Last edited by drdoug; Wed Jul 29 2020 03:34 PM.
Re: Low Oil Pressure ‘59 235
Phak1 #1371171 Wed Jul 29 2020 04:57 PM
Joined: Sep 2001
Posts: 30,487
ace skiver
Dave Hunt's Auto Services, Inc. [huntsmachine.com]

They do modern and performance engines.

In 2014 they had an engine-man who knew the high-pressure 235 (he had rebuilt many).

They did a very nice job on my 1954 truck 235 (to be used with a Hydra-Matic transmission).


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]
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