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<div><font size="2">Personally, I'd contact Steve (Clatter) on the Samba in the type 3 forum, as he's really a type 4 engine guy with a lot of experience with type 4 engines (has enough parts laying around to build a couple if needed in his engine room). You wouldn't have anything to loose but some time, and getting a second opinion from someone with experience never hurts. He even built a "sweep the floor" engine (showed the build up on STF) that went into his bus that he took the family on vacation with. He pointed out some things that not many people know about when building it that made some sense, and some of it could be thought of as off the wall. He does have a tendency to ramble on at times, but that's how he thinks at times. While we might talk to ourselves, he types it out in messages. He's also building a really nice, very well executed 67 Fastback with a t-4 in it. Give him a shout, maybe he can help.</font></div>
<div><font size="2">Bob 65 Notch w/sunroof<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Keith Park <topnotch@nycap.rr.com><br>
To: type3@vwtype3.org<br>
Sent: Fri, Aug 14, 2020 9:00 pm<br>
Subject: [T3] cranks and clearances<br>
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<div dir="ltr">Ok, Im getting Cranky!<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">The crank that was in my 2056 was a 10 under, thats fine, but for some<br>
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<div dir="ltr">reason despite my measuring .003 to .0035 main bearing clearances, it<br>
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<div dir="ltr">started <br>
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<div dir="ltr"><br>
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<div dir="ltr">to sieze when it got warmed up with the break in oil in there, what is<br>
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<div dir="ltr">additionally interesting is that the sacrificial bearing shells didnt do<br>
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<div dir="ltr">their work very well,<br>
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<div dir="ltr"><br>
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<div dir="ltr">you can run your fingernail across the journals and feel some light scoring.<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">The crank for this build is my spare, its seen alot of use and despite<br>
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<div dir="ltr">having 2 rod journals shells well into the copper the machine shop found it<br>
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<div dir="ltr">in the middle of the <br>
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<div dir="ltr"><br>
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<div dir="ltr">spec and just polished it, and it does, and did look good, except... the new<br>
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<div dir="ltr">bearing shells on it are a bit loose.<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">These are old stock Repco bearings, and im finding between .0045 for the<br>
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<div dir="ltr">split one to .005 for 1 and 3. Now im measuring this with a mic and bore<br>
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<div dir="ltr">gauge, using the mic's <br>
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<div dir="ltr"><br>
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<div dir="ltr">measurement for journal size as the 0 point for the bore gauge, so it should<br>
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<div dir="ltr">be accurate. Bearings all torqued into the case.<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">SO...<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">im kinda porked... the wear limit is .006 or so, so I should be around .002<br>
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<div dir="ltr">or 3, and the bearings are what the bearings are, the crank SHOULD be in<br>
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<div dir="ltr">spec, if the shop measured it properly<br>
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<div dir="ltr"><br>
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<div dir="ltr">and since they have better equipment that I do....<br>
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<div dir="ltr"><br>
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<div dir="ltr">Should I have it taken down 10? well.. they say its in spec NOW... and 10<br>
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<div dir="ltr">under didnt do wonders for the hardness layer on the last crank and since 2L<br>
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<div dir="ltr">Porsche cranks dont grow on trees... risk it<br>
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<div dir="ltr"><br>
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<div dir="ltr">or run the .005 with the stock journals and stock hardness layer intact?<br>
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<div dir="ltr">after the incident with the break in oil im inclined to keep things on the<br>
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<div dir="ltr">loose side of ideal but past builds have had<br>
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<div dir="ltr">oil pressure issues so its sensitive to that, although the previous build<br>
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<div dir="ltr">had NO pressure issues.<br>
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<div dir="ltr"> <br>
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<div dir="ltr"><br>
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<div dir="ltr">What to do? What are people finding the main bearing clearances to be out<br>
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<div dir="ltr">there in stock size land? they are sending me a set of silverlines to try,<br>
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<div dir="ltr">but they arent the quality of the Repco's.<br>
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<div dir="ltr">Keith<br>
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<div dir="ltr">Topnotch Restorations<br>
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<div dir="ltr"><a ymailto="mailto:topnotch@nycap.rr.com" href="mailto:topnotch@nycap.rr.com">topnotch@nycap.rr.com</a><br>
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<div dir="ltr"><br>
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<div dir="ltr"><a href="http://www.topnotchresto.com/" target="_blank">http://www.topnotchresto.com</a><br>
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<div dir="ltr"><br>
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<div dir="ltr">71 Squareback "Hothe"<br>
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<div dir="ltr">65 Notchback "El Baja Rojo"<br>
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<div dir="ltr">93 RX7 "Redstur"<br>
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<div dir="ltr"><br>
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<div dir="ltr">13 Subaru Outback "Blendin"<br>
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