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charleypete1957
New 315/325 hemi rebuild


I'm rebuilding a 1959 315 hemi truck engine I had bored out to 325 per Bob Walker, am using 10:1 compression Ross Pistons also per Bob. Everything has gone well so far. I got the heads bolted on, and now when I turn the engine over by hand I can feel places in the rotation like tiny, almost imperceptible tightenins and loosenings. That's the best way I know how to explain it. There's no interference, as I rotated the engine completely through two rotations after I adjusted each pushrod. Am I worried about nothing here? This is my first full blown rebuild so I'm not sure how it's supposed to feel. Any thoughts anyone?
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on: Sat 07 of Dec, 2019 [20:45 UTC] reads: 2558

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Re: New 315/325 hemi rebuild
on: Mon 16 of Dec, 2019 [14:59 UTC] score: 0.00
Charlie: We have too many customers who do not read the instruction on the Melling timing set box or read the warning on our invoice. If you used the big 'O' at bottom gear, you are about 2 1/2 teeth off. Look closely for a small center punch dent. That's your TDC. The reason I mention this is that error usually results in bent exhaust valves.
It's worth looking at, Bob





> I'm rebuilding a 1959 315 hemi truck engine I had bored out to 325 per Bob Walker, am using 10:1 compression Ross Pistons also per Bob. Everything has gone well so far. I got the heads bolted on, and now when I turn the engine over by hand I can feel places in the rotation like tiny, almost imperceptible tightenins and loosenings. That's the best way I know how to explain it. There's no interference, as I rotated the engine completely through two rotations after I adjusted each pushrod. Am I worried about nothing here? This is my first full blown rebuild so I'm not sure how it's supposed to feel. Any thoughts anyone?

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Jack
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Re: New 315/325 hemi rebuild
on: Fri 13 of Dec, 2019 [16:12 UTC] score: 0.00
Rotating the engine while driving the pump is a good idea.
Again, I am not familiar with Dodge, But on a Chrysler the oil path to the top is thru the camshaft, so oil only gets thru when the hole in the cam lines up with the passage to the top.
So the top doesn't get oil very often, and its hard to tell just when it does.

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charleypete1957
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Re: Re: New 315/325 hemi rebuild
on: Sun 15 of Dec, 2019 [19:52 UTC] score: 0.00
> Rotating the engine while driving the pump is a good idea.
> Again, I am not familiar with Dodge, But on a Chrysler the oil path to the top is thru the camshaft, so oil only gets thru when the hole in the cam lines up with the passage to the top.
> So the top doesn't get oil very often, and its hard to tell just when it does.

Jack, yes I know exactly where in the rotation the camshaft is lined up for each bank to get oil. I'd planned to put the crankshaft at that point for each bank during oil pump spinning to make sure everything, meaning the whole valve train, gets well lubed. Don't remember off hand where those points are but I made sure and found them and wrote them down during assembly. Thanks for your suggestions.

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Jack
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Re: New 315/325 hemi rebuild
on: Sun 08 of Dec, 2019 [15:24 UTC] score: 0.00
You make it sound like you rotated the engine after adjusting the valves
If the configuration is that same as a 392 one would torque the heads before adjusting the valves.
Also make sure you have plenty of oil in the cylinders, I guess you could get some binding if the cylinders (rings) are dry. Did you fit the rings to the bore?

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charleypete1957
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Re: Re: New 315/325 hemi rebuild
on: Thu 12 of Dec, 2019 [20:10 UTC] score: 0.00
> You make it sound like you rotated the engine after adjusting the valves
> If the configuration is that same as a 392 one would torque the heads before adjusting the valves.
> Also make sure you have plenty of oil in the cylinders, I guess you could get some binding if the cylinders (rings) are dry. Did you fit the rings to the bore?

Hey George
Yes, I torqued the heads in three stages then adjusted each rocker arm to specs. After each one was adjusted I then rotated the engine by hand through two complete revolutions to ensure that there was no valve interference. The little hesitations I feel may have been there before when I finished adjusting all the rockers (pushrods in this case) but I didn’t notice it until I came back to it a few weeks later. I will try what others have suggested, to squirt a little oil into each cylinder and spin the oil pump and build pressure in the whole system and see what happens. Thanks for your insights.

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George
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Re: Re: Re: New 315/325 hemi rebuild
on: Fri 13 of Dec, 2019 [16:08 UTC] score: 0.00
spin the oil pump and build pressure in the whole system and see what happens.



You need to do that before starting anyhow. Also (if hyd) lifters need to be pressurized before adjusting pushrods vs dry. When running O/P with drill motor have 1 person SLOWLY turning over the engine while the 2nd guy is running the drill. There are 2 places during the cycle that the rockers get oil. You'll hear a drop in tension when you get to each point. 1 place oils one side & the other side @ the other point.

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George
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Re: Re: New 315/325 hemi rebuild
on: Tue 10 of Dec, 2019 [22:09 UTC] score: 0.00

> Also make sure you have plenty of oil in the cylinders,

But not enough to hydraulic the cyl….

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charleypete1957
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Re: New 315/325 hemi rebuild
on: Sat 07 of Dec, 2019 [20:46 UTC] score: 0.00
> I'm rebuilding a 1959 315 hemi truck engine I had bored out to 325 per Bob Walker, am using 10:1 compression Ross Pistons also per Bob. Everything has gone well so far. I got the heads bolted on, and now when I turn the engine over by hand I can feel places in the rotation like tiny, almost imperceptible tightenins and loosenings. That's the best way I know how to explain it. There's no interference, as I rotated the engine completely through two rotations after I adjusted each pushrod. Am I worried about nothing here? This is my first full blown rebuild so I'm not sure how it's supposed to feel. Any thoughts anyone?


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