Piston/Con-rod Orientation? - Defender Source
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Old March 18th, 2016, 09:56 PM
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Piston/Con-rod Orientation?

I am in the middle of rebuilding my 3.5 V8, re-assembling my piston and ran into a problem. The manual says:

"Pistons have a 0.5mm offset gudgeon pin which can be identified by an arrow marked on the piston crown. This arrow MUST always point to the front of the engine."

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I have 2 questions:

1. When the machine shop assembled my piston to the con-rod, they used new pistons and I do not see an "arrow" marked anywhere on the piston. Is this going to cause a problem?

2. The gudgeon pin has a pressed fit onto the con-rod, there is no movement between the gudgeon pin and con-rod. The gudgeon pin though, slides easily back and forth in the piston, there is no retainer ring on either end to keep the gudgeon pin in place inside the piston. Is this normal?
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Old March 19th, 2016, 03:18 PM
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Any engine rebuilding gurus here? I am about to fit the pistons to the block and really don't want to mess this up.
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Old March 19th, 2016, 04:16 PM
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There should be some sort of stamp on the top of the piston like "std" or ".020" so orient it so the text is right way around when installed in the bore.
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Old March 19th, 2016, 09:08 PM
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Quote:
Originally Posted by o2batsea View Post
There should be some sort of stamp on the top of the piston like "std" or ".020" so orient it so the text is right way around when installed in the bore.
Thanks Bill,

I just check and there are some numbers stamped on the pistons. The machine shop installed all 8 pistons in the same orientation to the con-rod instead of having left bank backwards and right bank forwards. I assume they know what they are doing. Either that or these new pistons are symmetric and it won't matter.
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Old March 19th, 2016, 10:01 PM
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Pretty sure its the rods due to oiling holes and not the pistons that have to be installed right and left. See below


There are two requirements for proper connecting rod installation, whether you use the 215 or the Rover rods:

(1) On one side of the rod beam is a cast-in dimple, as shown at right. The rods must be installed with this dimple toward the front of the engine on the right bank cylinders and toward the rear on the left bank. The dimples on the rods on each crank journal will be facing one another.

(2) Each of the rod caps have oil spurt holes on one side, next to the bolt. Assembly must be made with the spurt hole "up" as shown above.

I'd call D&D and ask them your questions.

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Old March 20th, 2016, 09:03 AM
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Thanks for the info Doug. You are probably correct. I read in the V8 rebuild manual about the dimples on the con-rod and my rods have those. I will make sure to install the rods in the correct orientation. Right above that paragraph about the dimples is where I snapped that picture regarding the arrows on the pistons in my first post. Not sure what to make of that but since I am using new pistons I guess it will not matter.
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