connecting rod origination - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 16 (permalink) Old 02-16-2017, 09:48 AM Thread Starter
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connecting rod origination

Putting one new rod and bearings in a vt750 guess who didn't mark the caps when he removed them! I was hoping the manual would show me, but all it did was remind me to mark things so I can put them back the same way. Does anybody know which way the tabs on the connecting rod bearing is originated. Does it face away from crank pin or does it matter. I see the pistons are marked for intake valve. After doing this for 35 years you think I would have learned!! I would greatly appreciate any help I can get. thanks

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post #2 of 16 (permalink) Old 02-16-2017, 10:13 AM
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If you took the rod off the piston,,,I would check for an oiling hole,,,if there is not one just pick a way an put it together. If you are talking about the caps themselves you should be able to see a image pattern on the rod and cap of the tabs on the opposite side.

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post #3 of 16 (permalink) Old 02-16-2017, 12:28 PM Thread Starter
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Thanks for your replay new rod and piston new bearings everything was a part, my bad
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post #4 of 16 (permalink) Old 02-16-2017, 01:10 PM
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Originally Posted by matt_t View Post
Thanks for your replay new rod and piston new bearings everything was a part, my bad
If you have the old parts look at them closely to see how they were put together.

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post #5 of 16 (permalink) Old 02-16-2017, 01:21 PM
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If they have oil holes drilled on one side of the rod match it up with the other rod and piston. But I see in my manual there is a spray jet down in the block on my old 1983, so maybe those don't have a drilling into the rod big end for oil onto the cylinder wall.
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post #6 of 16 (permalink) Old 02-16-2017, 02:14 PM
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I am curious about the rod direction also and maybe if it doesn't have an oil hole as many don't, they may be reverseable? Here is a photo from a 98-03 ACE manual that shows some stamping or forging marks on one side, maybe that is a clue.
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post #7 of 16 (permalink) Old 02-16-2017, 02:36 PM Thread Starter
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I looked at that. The weird part to that is I'm putting a new rod in and using one old the new rod marking are opposite the ones on the old rod. On Chevy v-8 they want all the bearing tabs in and ford wants them out, but I that has to do with piston shirt. And of coarse that's the one I'm not sure of.
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post #8 of 16 (permalink) Old 02-16-2017, 02:59 PM
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Maybe lay the new and old rod side by side and see if you can find different dimensions, shapes, off center, etc. It seems if it were very important at least one of the manuals would describe it well.
I always found it fascination that piston wrist pin holes are machined slightly off center to allow for the thrust side pressure difference when being forced down by compression. That's why they have a front arrow.

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post #9 of 16 (permalink) Old 02-16-2017, 03:40 PM Thread Starter
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I have looked at the new and old rods until my eye crossed. If I was double jointed I would kick myself in the butt for not marking. Thanks for getting back me to me.
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post #10 of 16 (permalink) Old 02-16-2017, 08:38 PM
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Originally Posted by matt_t View Post
I have looked at the new and old rods until my eye crossed. If I was double jointed I would kick myself in the butt for not marking. Thanks for getting back me to me.
Well by my calculations you have a 1 in 4 shot at getting it right the first time. I think plastigauge just might give you the answer but im not real sure.

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