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rubbing pushrods https://ausmini.com/forums/viewtopic.php?f=2&t=92701 |
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Author: | simon k [ Sun May 22, 2016 12:57 pm ] |
Post subject: | rubbing pushrods |
there was some interesting discussion in another thread a little while ago about pushrods rubbing on blocks. I had my head off yesterday and found that I have exactly this issue... thick flange 1100S block w/ 12G940 head RE83 cam Minisport 1.3:1 roller rockers 1mm spacers under posts all of the pushrod holes have the same issue, they're too far back and too close to the centre of the bore. Most of the pushrods have the same sort of wear, either in 2 spots or just 1. The one pictured below is the worst something else to correct next time I have it apart... I guess a bit of paint on them and turn the engine over to see wear it rubs then grind it away, or do you simply bore the hole to line up with the head? Attachment: pushrod hole.jpg Attachment: pushrod wear.jpg
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Author: | TK [ Sun May 22, 2016 1:12 pm ] |
Post subject: | Re: rubbing pushrods |
If my memory serves me correct, when Vizard identified the problem years ago said you need to oval the hole in the block rather than make it simply a bigger round hole. I think that he even had photos of a block cut away in one of his books. |
Author: | Alexw [ Sun May 22, 2016 7:28 pm ] |
Post subject: | Re: rubbing pushrods |
What were the issues with simply making the hole bigger? |
Author: | deluxe67 [ Sun May 22, 2016 7:34 pm ] |
Post subject: | Re: rubbing pushrods |
Are your rockers centralised over the valve stems? |
Author: | simon k [ Sun May 22, 2016 8:07 pm ] |
Post subject: | Re: rubbing pushrods |
deluxe67 wrote: Are your rockers centralised over the valve stems? yep |
Author: | drmini in aust [ Tue May 24, 2016 4:19 pm ] |
Post subject: | Re: rubbing pushrods |
TK wrote: If my memory serves me correct, when Vizard identified the problem years ago said you need to oval the hole in the block rather than make it simply a bigger round hole. I think that he even had photos of a block cut away in one of his books. I seem to remember Matt Read saying he has always just drilled the block holes bigger during a rebuild. This was in the context of better oil drain back, pushrod rubbing wasn't mentioned then. |
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