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Post by 1800heap on Apr 12, 2017 2:18:43 GMT
I have pulled apart my engine recently and had a look at the wear in the bores and thought it wasn't bad at all and was not going to bother with a re-bore. Looked a bit closer today and noticed on number 1 quite a big ridge but only half way round and on the water pump side. Must be to do with the pump but why?
Nick
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Post by dave1800 on Apr 12, 2017 5:43:55 GMT
Have you checked the rings on No1 or whether the con rod is bent. I can't see how the pump would cause this. You really need to measure the bores in all dimensions to see whether a rebore is needed. David I have pulled apart my engine recently and had a look at the wear in the bores and thought it wasn't bad at all and was not going to bother with a re-bore. Looked a bit closer today and noticed on number 1 quite a big ridge but only half way round and on the water pump side. Must be to do with the pump but why? Nick |
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Post by 1800heap on Apr 12, 2017 6:57:46 GMT
I thought it was odd. Just measured roughly with feeler gauge and the other cylinders are about 1.5 thou all round. Putting a 2 thou in I can still feel edge.
Number 1 a 10 thou feeler is level with the untouched rim at the worst bit, which is center with the pump, so front edge. The opposite side is 2 though ish. Havent checked the rings on number 1 yet. Engine feels quite free. Rod 1 has about 10 thou of end float which is better than the others actually. Are you thinking some kind of side load? I wondered if it could be a cool/ hot spot causing it to do with the pump?
Nick
Ps I think the pistons are +40 so it has been rebored b4.
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Post by dave1800 on Apr 12, 2017 8:16:52 GMT
I've never noticed that issue with No1 cylinder on any of my B series engines. Perhaps someone else here who currently has an engine apart could confirm?
Yes, I was thinking of some side thrust being the possible cause, either a distorted con rod or gudgeon pin bearing. Is there any scoring?
David
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Post by 1800heap on Apr 12, 2017 8:41:10 GMT
Apart from the ridge looks good which is why I didnt notice it at first.
Could it be something to do with the previous re-bore?
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Post by dave1800 on Apr 12, 2017 10:39:04 GMT
It should have been perfect after the last rebore.
David
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