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OT :Re: New Engine question
Posted by: MattNall ()
Date: November 16, 2020 09:38PM

THis made me think of the Asian Worthington CLONE Single stage Air Compressor HEAD I purchased on ebay last year.

Free replacement if it fails in 6 mths. No mention of hours, etc.

When rotating by hand I felt a small "catch"... bolted it on and turned on the 220

Pressure switch is set for 145-165 psi. Old GE 5 hp Compressor motor kicked off at 150.[ thermal on motor ]..never had before and had to run longer on initial pump to 165. with old 2 -stage Worthington. Removed thermal switch! Fixed checkvalve and added valve at tank outlet. Now holds 100psi for over a week.

Probably has 20 hrs on it now...quiet as can be. No "smoked" motor! Takes approx. 3 minutes to reach 165. and has run a few busy 8-10 hr, days when using air tools.. Two of us working. I got lucky, as did the seller! Glad I only had $150 invested...unlike an engine rebuild.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: New Engine question
Posted by: bmarsh52 ()
Date: November 17, 2020 04:55AM

Did not measure cam to block clearance. Cam surfaces on block looked very good.
Cam is new Otto and gear is new Fail Safe. New thrust washer also.

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Re: New Engine question
Posted by: JimBrandberg ()
Date: November 17, 2020 06:39AM

So it feels tight on every revolution of the crankshaft?

Compression and cam/valvetrain events take place every second revolution except for exhaust lobes which do something every revolution on opposing cylinders.

I realize I'm not helping except to return to basics in looking for possibilities.

I keep thinking of things before the cylinders go on.

Al you're really out is head gaskets if you start backing things up. Not even that if they're copper.

I had one a few years ago that was tight getting the crankshaft and camshaft to initially turn. Once it was turning it was fine. I agonized over it for a while before starting with another crankcase and then all was well. It's not comparable to what you're experiencing except for the idea of trusting your gut that something does not feel right.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: New Engine question
Posted by: bmarsh52 ()
Date: November 17, 2020 10:26AM

I checked the rod bolts and no interference there.

Going to pull the bell housing next since the noise is coming from that end of the block.

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Re: New Engine question
Posted by: Wagon Master ()
Date: November 17, 2020 12:15PM

If you understand the term "witness mark", that's what I'd be looking for. Good Luck. Hope it's simple.

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Re: New Engine question
Posted by: davemotohead ()
Date: November 17, 2020 12:33PM

Do you have the Flywheel installed? Could be the flywheel hitting the lower bell housing bolts?







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: New Engine question
Posted by: jjohnsonjo ()
Date: November 17, 2020 01:02PM

davemotohead Wrote:
-------------------------------------------------------
> Do you have the Flywheel installed? Could be the flywheel hitting the lower bell housing bolts?

Like washers where they don't belong, be nice if its that simple

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: New Engine question
Posted by: REM654DPG ()
Date: November 21, 2020 01:16AM

In your previous post you stated:

"Checked rod bolts and they are at 30 ft lbs which is the specification from ARP for their rod bolts".

Check the nuts that came with those ARP bolts and make sure they are not the large 6 point style as they can cause catastophic engine failure. The large ones will bottom out on the seat raduis of the cap and prevent it from fully seating and torquing properly.

Many of these ARP rod bolt sets came with the wrong nut for the Corvair application so be sure you have the smaller 12 Pt style as shown in the third picture.

Regan Metcalf
Portland, OR

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Re: New Engine question
Posted by: davemotohead ()
Date: November 21, 2020 08:29AM

To add to what Regan M States, the Clarks ARP rod bolt sets come with the wrong nuts, who knows why? But they are the 6 sided wrong nuts, all the rod bolt sets I have gotten in the ARP packaging are the correct 12 point nuts, also, I used a stretch gauge with the ARP specs and found 32 ft lbs is the proper torque for the ARP bolts, even though ARP suggest 30 ft lbs if you do not have a stretch gauge, I have found 32 ft lbs is the proper torque for these ARP rod bolts to attain the proper stretch.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: New Engine question
Posted by: Wagon Master ()
Date: November 21, 2020 08:41AM

With two different stretch gauges, and two different torque wrenches, I can see there being a two foot-pound discrepancy, but thanks for the tip.

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Re: New Engine question
Posted by: davemotohead ()
Date: November 21, 2020 09:02AM

Wagon Master Wrote:
-------------------------------------------------------
> With two different stretch gauges, and two different torque wrenches, I can see there being a two foot-pound discrepancy, but thanks for the tip.
———————————————————
All my wrenches and gauges are calibrated, Also my info was backed up by a few of the Corvair racers as well, But I do see your point, no 2 torque wrenches are the same.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: New Engine question
Posted by: bmarsh52 ()
Date: November 21, 2020 05:33PM

I have the 12 point nuts on the APR rod bolts. I backed off all the rockers and the binding goes away.

When I installed the new valve springs several of them were a very tight fit in the head pockets and were difficult to compress. I did remember the shims under the springs.

I am going to work to see if adjusting the valves on any one particular cylinder is the cause to try to isolate the condition.

Keep the suggestions coming.

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Re: New Engine question
Posted by: jjohnsonjo ()
Date: November 21, 2020 05:59PM

Are you certain all the push rods are fully seated in the lifter dimple?

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: New Engine question
Posted by: bmarsh52 ()
Date: November 21, 2020 06:03PM

I have made it a point to check every push rod for this and held the rocker until it reaches zero lash.

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Re: New Engine question
Posted by: REM654DPG ()
Date: November 21, 2020 06:31PM

I recently pulled a half assembled engine apart that had a tight spot like you're decribing and it turned out to be the harmonic balancer was rubbing on the rear housing.

It only hit in one spot of the rotation and I thought for sure it was a cam/crank gear issue but the two cast parts did not want to play nice with eachother. This is the first time I've seen this problem so I'm guessing it's not very common.

Regan Metcalf
Portland, OR

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Re: New Engine question
Posted by: JimBrandberg ()
Date: November 22, 2020 03:42AM

Was it one of the new Chinese harmonic balancers?

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: New Engine question
Posted by: dryenko ()
Date: November 22, 2020 07:16AM

The casting and ring surface sure looks like it ??
Clark's abandoned those .
Poor quality and quality assurance.

Bob C aka Dryenko
Dobson, NC 27017

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Re: New Engine question
Posted by: bmarsh52 ()
Date: November 22, 2020 06:02PM

One more observation that may be related.

Had the heads rebuild by a very reputable shop. New springs were provided but about half of them were hard to install into the valve pockets in the head. By hard I mean they didn't just drop in. Several had to be persuaded gently with a rubber mallet.

Could this have any impact on the rotation of the engine?

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Re: New Engine question
Posted by: REM654DPG ()
Date: November 22, 2020 11:44PM

If you can, double check that there is no coil-bind with those springs at full lift and that the retainers are not hitting the stem seals or the top of the guides.

Regan Metcalf
Portland, OR

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Re: New Engine question
Posted by: Wagon Master ()
Date: November 23, 2020 05:11AM

You definitely could get coil bind at max lift if one of the springs is not seated in the pocket in the head.

'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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