1200cc 40 hp connecting rod installation problem??

pablovent

Hi,

Still with question about 1200cc 40hp engine,apreciate your advices.

Now with rods problem.......These old rods use bolts and aparently the offset not well between both sides of the rod (cap), to install new bearings do not soft move like a 1300-1600cc rods, which is the way to center them and achieve soft move?

Regards.

glutamodo · Posted: Wed Apr 16, 2014 7:30 pm Post subject:

You tap on them with a small hammer as you torque the bolts.

Image may have been reduced in size. Click image to view fullscreen.

And if you have forge marks on the rods, they are offset - always install those with the forge mark facing upwards.

-Andy

pablovent · Posted: Wed Apr 16, 2014 7:40 pm Post subject:

glutamodo · Posted: Wed Apr 16, 2014 7:45 pm Post subject:

I'd say, all of the above if you have binding. You might want to torque in a couple of steps and check for binding, and tap-tap, as you go.

pablovent · Posted: Wed Apr 16, 2014 7:49 pm Post subject:

drscope · Posted: Thu Apr 17, 2014 6:25 pm Post subject:

Did you measure?
_________________
Mother Nature is a Mean Evil Bitch!

pablovent · Posted: Thu Apr 17, 2014 6:37 pm Post subject:

mrbigmax · Posted: Fri Apr 18, 2014 11:30 pm Post subject:

Here's a god simple way to check the clearances. Plastigage. Commonly found at auto parts stores up here. http://www.plastigaugeusa.com/how.html

pablovent · Posted: Sat Apr 19, 2014 6:43 am Post subject:

pablovent · Posted: Wed Apr 23, 2014 4:27 am Post subject:

Finally, before resized work, machinist could rods alignment work well, and they were all good round to 2.2767"(+/-0.0001), only was necessary to slightly soften new bearings, the process was done with polishing paste (valve seats) in a tool crankshaft type (of the corresponding measure) turning the each rod with bearings installed softly (full bolts torque) being spent only small points that pressed the movement. Now all rods down softly by gravity, clearance aprox 0.003" between OD rods (with bearings) and crankshaft.

Regards.

Dr OnHolliday · Posted: Wed Apr 23, 2014 6:59 am Post subject:

I'm not sure we're understanding each other. You can't put valve grinding compound on bearings - it will imbed in the bearing and grind down the crank journal.
_________________
1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust

pablovent · Posted: Wed Apr 23, 2014 9:52 am Post subject:

Dr OnHolliday · Posted: Wed Apr 23, 2014 6:25 pm Post subject:

(using my best Chris Rock voice) "Nah - I wouldn't do that shit, man!"

Really, insert bearings are soft / abrasive powders are hard. Hard abrasive particles get stuck / imbeded into soft bearings. Result is trashed crank and engine.

I have never heard / read about such an approach in 49 years of reading hot rod or other car and motorcycle enthusiast magazines and books, or in auto shop class.

You are on the wrong path here, amigo.
_________________
1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust

pablovent · Posted: Thu Apr 24, 2014 5:07 am Post subject:


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