Little background story: This Engine had a rodbearing failure, was rebuild 500km ago with new crank, rods, bearings etc. But previous owner had no receipt for this.
Cams and followers looked really bad, like driving with 5w30 oil thousand of miles. So i decided to open it up.
Beside much brand new engine parts, I found the reason for the previous rod bearing failure (and the next was not far away).
So i ordered a Pierburg aftermarket pump and this arrived:
Like new OEM Pumps, it had a sharp edge inside the bore from the piston. Exactly where the old piston failed. I know some engine builders, that smooth these edges. I did this also with a very small diamond file.
Just for interest, I measured the new piston that is made from aluminum like the old one but is now black hard anodized, the old worn piston and the S50 stainless piston that many people use with success. The stainless piston fitted very nice into the old worn pump, but had little to no play in the new pump. So I decided to not use it, to avoid that it get stuck.
Cams and followers looked really bad, like driving with 5w30 oil thousand of miles. So i decided to open it up.
Beside much brand new engine parts, I found the reason for the previous rod bearing failure (and the next was not far away).
So i ordered a Pierburg aftermarket pump and this arrived:
Like new OEM Pumps, it had a sharp edge inside the bore from the piston. Exactly where the old piston failed. I know some engine builders, that smooth these edges. I did this also with a very small diamond file.
Just for interest, I measured the new piston that is made from aluminum like the old one but is now black hard anodized, the old worn piston and the S50 stainless piston that many people use with success. The stainless piston fitted very nice into the old worn pump, but had little to no play in the new pump. So I decided to not use it, to avoid that it get stuck.
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