Re: Connecting Rod Alignment?
Posted by Scott726 On 2008/4/6 19:46:57
Guys,
Thanks for all the feedback, here are a few updates
-Yes I have the red covered manual, it's mostly worthless. It does show a rod alignment jig that checks the piston, wrist pin and connecting rod as an assembly, with no more details.
-My connecting rods are all shimmed, as if the babbitt was machined too tight and somebody hand cut crude .001 or .0015 brass shims to open it up a bit. It's still too tight if I remove them, around .001".0015" by plasti gage. None of my mains have been shimmed but then I haven't checked them all.
-I am certain Dave is correct in that the ultimate front to back location of the rod is controlled by the side faces of the connecting rod babbitt.
-I haven't checked to see if there are different odd and even rods. Oddly, the odd rod is in the right place...
-I don't know who made the pistons but I have posted their photo here, maybe somebody can tell me as they are like most other parts, unmarked.
-#2 is the only piston/rod assembly I have removed. I can tell you that it's wrist pin is snug, both in the piston and in the bushing, it takes a little force to push it and it won't slide out on it's own. This engine was running with 40+ psi of oil pressure and none of the bearings looked bad, even the remainder of the cap that failed looked good.
The knock was only associated with the clutch. When the engine was cold it would knock the first time you pushed in the clutch. It would knock at a diminished volume after you let up on the clutch and would continue to do so until the engine warmed up. It wouldn't knock again until the engine was stone cold and yes, I have looked at the clutch, pressure plate and throw out bearing. I believe the knock was in the area of #4 or #5 piston.
This inside of this engine is tight, and clean. I really don't want to take it further apart than I have to. I'm just looking for a little knowledge on the rod alignment issue. I would prefer to put if back together, and save my pennies for a major rebuild if I can safely drive it for a season or two.
Thanks again,
Scott
PS: PackardV8, if you PM me your E-mail address, I'll send you a digital recording of the knock...
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Thanks for all the feedback, here are a few updates
-Yes I have the red covered manual, it's mostly worthless. It does show a rod alignment jig that checks the piston, wrist pin and connecting rod as an assembly, with no more details.
-My connecting rods are all shimmed, as if the babbitt was machined too tight and somebody hand cut crude .001 or .0015 brass shims to open it up a bit. It's still too tight if I remove them, around .001".0015" by plasti gage. None of my mains have been shimmed but then I haven't checked them all.
-I am certain Dave is correct in that the ultimate front to back location of the rod is controlled by the side faces of the connecting rod babbitt.
-I haven't checked to see if there are different odd and even rods. Oddly, the odd rod is in the right place...
-I don't know who made the pistons but I have posted their photo here, maybe somebody can tell me as they are like most other parts, unmarked.
-#2 is the only piston/rod assembly I have removed. I can tell you that it's wrist pin is snug, both in the piston and in the bushing, it takes a little force to push it and it won't slide out on it's own. This engine was running with 40+ psi of oil pressure and none of the bearings looked bad, even the remainder of the cap that failed looked good.
The knock was only associated with the clutch. When the engine was cold it would knock the first time you pushed in the clutch. It would knock at a diminished volume after you let up on the clutch and would continue to do so until the engine warmed up. It wouldn't knock again until the engine was stone cold and yes, I have looked at the clutch, pressure plate and throw out bearing. I believe the knock was in the area of #4 or #5 piston.
This inside of this engine is tight, and clean. I really don't want to take it further apart than I have to. I'm just looking for a little knowledge on the rod alignment issue. I would prefer to put if back together, and save my pennies for a major rebuild if I can safely drive it for a season or two.
Thanks again,
Scott
PS: PackardV8, if you PM me your E-mail address, I'll send you a digital recording of the knock...
Attach file:
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