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Discussion Starter #1
Have rod knock 82000 miles bottom end, 40000 miles top end, 2nd top end. going to tear into this weekend, have 5000 dollars in motor already, trying to go cheap as possible. if i have to split the cases do i stay 98in or go 113/114, harley parts are relatively cheap.
 

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If it is a rod knock, you most likely will have to change the crank or have it turned. I guess that would mean splitting the cases.
 

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426 Posts
lower end change

If your stock 4" lower end needs to be replaced then by all means get the newer 4.375 stroke lower end. You also have to change the pistons but you'll be able to use the same cylinders and have them bored to the new 103 or 107 pistons. All your other parts will work fine with the new lower end. good luck dsv
 

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IronButt
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6,364 Posts
Low dollar SE crank, plug and weld the crank, and with those cylinders if they are still in good shape, touch them lightly with a hone, and run a 107 piston coated.
 

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Discussion Starter #5
just had the leak down done, they think its a piston ring.
frt compression 192 leakdown 5%
rr compression 186 leakdown 9%
 

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just had the leak down done, they think its a piston ring.
frt compression 192 leakdown 5%
rr compression 186 leakdown 9%
6 lbs cranking pressure difference and they are telling you it's a ring knock? Haven't heard of that one yet, maybe piston slap but haven't heard of a ring knock.
 

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Discussion Starter #7
Started the tear down today, those TP rocker boxes are a bitch the rear one especially, any one have any secrets or a special tool for the allens. didnt see any thing wrong with the roller rockers, you can see where the rollers have been riding pefectly down the middle of the valve stems. all 4 lifters have scuffs or marks or styrations all around the bottom of the lifters, you cant feel them with your nails, these have 42,000 miles they are B lifters. took the cam cover off and started to take the cam plate off, then we saw we needed a puller to get the gears off, this is a 37G cam set up. will work more tomorrw and report back thanks. also these are gmr pushrods we noticed that both exhaust were in the front cyl, and both intakes were in the rearcyl, from a previous builder, will this matter at all.
 

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Discussion Starter #8
Well pulled the gears and the oil pump, do not see any marks on the oil pump or the bushings. on the end of the pinion shaft are a couple of light marks, checked the run out looks the .004, not sure because the tip of the gauge was on an angle on the shaft, does the tip have to be straight up and down. pulled the heads, more carbon on the rear cylinder than the front. the cylinders have perfect cross hatches on the top 3/4 of the cylinder with some light marks going vertical. the front piston is discolored on the back side no broken rings, front or back. the rods have no up and down movement, but the side to side movement on the front rod is more noticable than the rear rod, not a real mechanic, so do not know what is acceptable. any one have any comments after all these posts thanks.
 
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