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Rebuild WITHOUT align (line?) boring??
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SamboSamba22
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PostPosted: Sun Apr 15, 2018 2:33 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

Awaken from the dead.

Am I a fool to consider building this motor back up without align-boring this case?
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No catches in the journals, sure some discoloration, but all the standard bearings still fit snug inside their perspective journals.
Thoughts???
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drs1023
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PostPosted: Sun Apr 15, 2018 2:47 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

Line (or align if you prefer) boring is cheap enough at this point. Check the case at the flywheel. Most reputable shops will have stamped any previous over bore size. With the increased price of VW parts over the last couple of decade and the dwindling supply of original cases, I wouldn't take the chance of a rebuild without making sure everything is properly in place before spending money on parts. Align boring doesn't mean you have to have the crankshaft resurfaced if it mic's in spec (to the 4th decimal place, please)
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PostPosted: Sun Apr 15, 2018 4:12 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

is Line boring the best place to save money I don't think so I don't know what it cost to have one bored (I have a boring tool )but if it was mine I would find another place to save money
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wcfvw69
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PostPosted: Sun Apr 15, 2018 4:39 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

I'd get it align bored. $100ish dollars is good money spent to try to maximize the life of the engine.

I did rebuild a bug engine once that barely had a ridge on one saddle. The crank was fine so it was polished with fine crocus cloth. All new bearings, rebuilt rods, heads and new pistons/cylinders. Runs fine, good oil pressure and has 8k trouble free miles so far. Smooth w/no vibrations either at higher RPM.

This bug doesn't get driven much and the engine rebuild will last my lifetime. Wink
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SamboSamba22
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PostPosted: Mon Apr 16, 2018 12:46 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

The expense isnít necessarily the issue, itís finding a reputable business to complete the work.
I donít want to ship my case to California.
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60ragtop Premium Member
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PostPosted: Mon Apr 16, 2018 1:18 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

I did the same to a standard case 5 years ago. Bearings fit tight, no ridge on saddle, put in a new crank and rods as it had spun a rod bearing. It lasted for 45K till it developed a noise which turned out to be a loose cam gear. So we are going to to it again with new bearings and a new cam.
End play was in spec, had 135-140 PSI in each cylinder. Bolted the bare case together and it passed the middle saddle test so good to go.
Still experimenting after 40+ years Laughing
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VW_Jimbo
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PostPosted: Mon Apr 16, 2018 2:52 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

I was taught if you can read the embossed lettering on the back of the bearings, on the case saddles, it is time to align-bore the case. I can read the bearing part number. Time to bore!

Cheap insurance!
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Max Welton
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PostPosted: Mon Apr 16, 2018 4:39 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

I am of the opinion that well balanced rotating and reciprocating assemblies means less wear and tear on the case bearing saddles.

If you start with a case that is right, and have everything professionally balanced and add real oil filtration the case should last virtually forever.

I'm 61 so "forever" is around 30 years. Very Happy

Max
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PostPosted: Mon Apr 16, 2018 5:47 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

just measure your case if it is in tolerance its all good if not have it bored why is this so hard
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TDCTDI
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PostPosted: Mon Apr 16, 2018 7:05 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

Well... eight years later, hey djkeev, howíd it work out for you?
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PostPosted: Mon Apr 16, 2018 10:17 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

TDCTDI wrote:
Well... eight years later, hey djkeev, howíd it work out for you?


I had a very successful rebuild.
While I'm no pro I took the best steps I could during the ptocess.

It ran strong.
I don't know the long term result for I sold the car about three years ago.
I've not received any irate communication from the buyer....... he knows where I live.

I don't miss the Beetle itself but that was a fine running engine.

Dave
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PostPosted: Tue Apr 17, 2018 5:15 am    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

I can see both sides of the question. It became standard practice to eliminate any questions and run the bar through it no matter what it looked like, and more often than not the area around thrust bearing needed attention, easier to just do it while itís down. The decision not to cut means you must have an experienced eye and usually it will be a low mileage engine that has failed for some other reason and has never been overheated. Properly maintained and driven the lower end should last over 100k miles, as mentioned a balanced engine with filtered oil can make this a reality. So if you donít know what to look for and have an extra 60-80 bucks go ahead and cut it. Unrelated but added fun is when you get all this figured out and upon torquing the nuts around perimeter of case half it quits turning and then you find itís been overheated and warped around the cam area. 😀 joy tear it all apart and find someone that knows how to fix that. That used to happen too.
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Max Welton
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PostPosted: Tue Apr 17, 2018 10:24 pm    Post subject: Re: Rebuild WITHOUT align (line?) boring?? Reply with quote

Having watched the hobby and supporting industry shrink over the years, I am of the opinion that in less than one decade it will no longer be possible to buy a new case that doesn't need work or find a shop that can do that work at any reasonable cost.

I have two good cases. They are both straight, full flowed and have bronze lifter bores.

I do not regard them as disposable. I expect them to remain serviceable until I can no longer drive.

Max
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