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A crankshaft.

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Opa A

01-13-2005 16:05:30

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Just disassemble the engine on my A. Engine was running but looking in the intake ports and seeing the rust deposits etc I decided to pull her apart. Head, guides and valves are in decent shape. Found a little bit of rust pitting in #2 and #3 cylinder liners. The rod & main bearings are bad, looks like they are acid etched from moisture in the oil. I wasn't worried until I seen the bearings are 0.030US and the crank journals are not in great shape either. The service manual says the bearing surfaces are "Tocco-hardened" can anyone tell what this is, and how deep into the surface it would have went. Glad I looked, I think she would have come apart on her own soon.

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gene b

01-14-2005 06:50:53

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

Reground crank with bearings 288.00 exchange. Sleeves and pistons 319.00 Pluss discount if purchased before feb 15. send e-mail for details

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Andy Martin

01-14-2005 05:48:48

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

Not a bad idea to rebuild, but you'd be surprised how long the old girl would run with loose bearings.

The key is low rpm's. An automobile at 3500 rpm or more requires a lot better clearances than a tractor at 1500.

I thought you could get 0.040 bearings and turn the crank, but maybe not on an A.

Of course I'd buy a set of 0.030 bearings after checking the crank (with a mic) and run it a little loose for a low dollar repair. If the bearings are etched you may have a crank that is OK. Remember: 1 low rpm, 2 engine designed for inferior motor oil

I'm a heretic but have never thrown a rod in an old IH engine and don't waste money trying to get back to factory specifications because I work my tractors and will wear out whatever I put in anyway. Most collectors put a lot of money in an old tractor to "make it right" and then never put over a couple of thousand hours on it, and not under load to boot.

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Opa A

01-14-2005 12:57:12

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Re: A crankshaft. in reply to Andy Martin, 01-14-2005 05:48:48

Just finished measuring crank. Not quite as bad as I thought but bad enough. Worst rod journal is worn .0014, .0008 out of round and tapered .0016. Worst main is worn .0015, .0006 out of round and tapered .0015". I may have found a good crank and pulley as the front pulley is a little loose too. I'm going to check the rest of the tractor's innards before putting too much into the engine. Found listings for .040 under rod bearings but not mains.

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scott#2

01-13-2005 17:52:19

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

Blind me... .030us??? Time for a new crank or a rebuild on that one.

scott

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Opa A

01-14-2005 12:31:37

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Re: A crankshaft. in reply to scott#2, 01-13-2005 17:52:19

Stamped on back of bearings 030 US. Also date stamped 12 58.

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lee

01-13-2005 17:47:14

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

I'd look for another crank. You might get lucky to find a fresh ground crank fair priced.

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scott#2

01-13-2005 17:24:38

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

This is a type of induction hardness treating with results that are similar to flame hardening except that the tocco process uses electrical induction to achieve a specified temp. before quenching. Most commonly used in the treating of cams, cranks, etc. This is usually a "complete hardening" process and not usually used as a surface or area specific treatment. However it depends on the technician that performed the process to adhere to specific time intervals to achieve the proper hareness treatment. Tocco hardness will usually test out to 55+- on a rockwell c scale. No problem turning the shaft. Have a hardness test performed on the counter weights and areas close to or on the journal itself if your concerned. This will tell the tail on the quality of the original hardness job.

Hope this helps,

scott#2

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Opa A

01-14-2005 12:28:55

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Re: A crankshaft. in reply to scott#2, 01-13-2005 17:24:38

Thanks for the info.

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justin w

01-13-2005 17:23:52

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Re: A crankshaft. in reply to Opa A, 01-13-2005 16:05:30

different people will say different things about the hardning of the IH cranks. Most will say not to go beyond 0.030, but the aftermarket in some cases did make 0.040 & 0.060 (semi-finished) bearings. The 0.060 bearings were marketed mainly so a shop could carry one size of bearing & finsih size it to the desired undersize. IH did market 0.032 slight wear bearings for the 0.030 crank. If you are interested I can supply an IH factory reground crank in 0.030 with the rod bearings, main bearings, and NOS crank pulley.. Email me if interested.

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