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| Head gasket issue https://ausmini.com/forums/viewtopic.php?f=2&t=97933 |
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| Author: | Ian_B [ Sat Nov 10, 2018 1:39 pm ] |
| Post subject: | Head gasket issue |
Pistons come right to top of bore BK450 gasket overhangs bore a little Middle cylinders 73mm bore not offset. Do I run with it till it fails if it does or go with a cometic gasket that doesnt use fire rings. Finish on head and block is very smooth but not measured. So close and this issue raises its head |
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| Author: | Ian_B [ Sat Nov 10, 2018 7:04 pm ] |
| Post subject: | Re: Head gasket issue |
Keith Calver knows this issue. Has a good article on it about using a head gasket as a guide for boring. Not many do here it seems |
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| Author: | drmini in aust [ Sat Nov 10, 2018 9:16 pm ] |
| Post subject: | Re: Head gasket issue |
Bore of a BK450 gasket is 73.5mm I just measured a couple. So even if not offset bored, there's probably not much in it. My 1360 motor is also 73mm bore, not offset and never had a BK450 gasket failure. Has been to 8000 a few times. It does have .010" deck height though. |
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| Author: | ken@miniauto [ Sat Nov 10, 2018 9:27 pm ] |
| Post subject: | Re: Head gasket issue |
Cometic C4148 gaskets are 74mm and are available from .030" thick . Not cheap but do the job |
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| Author: | Ian_B [ Sun Nov 11, 2018 3:04 pm ] |
| Post subject: | Re: Head gasket issue |
Thanks guys Will go cometic .Its bloody hard to machine the pistons to get deck clearance once they are pressed on the rods lol. |
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| Author: | simon k [ Mon Nov 12, 2018 9:12 pm ] |
| Post subject: | Re: Head gasket issue |
Ian_B wrote: Thanks guys Will go cometic .Its bloody hard to machine the pistons to get deck clearance once they are pressed on the rods lol. nahhhh mate, just put them at TDC and run a rasp over the lot |
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| Author: | Ian_B [ Fri Nov 23, 2018 7:57 pm ] |
| Post subject: | Re: Head gasket issue |
Thanks guys All redone today with a 74mm cometic .027 that I didnt know existed Will be all fine now as my local machinist insisted on decking the block and head to a mirror finish. |
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| Author: | peterb [ Sun Nov 25, 2018 8:13 am ] |
| Post subject: | Re: Head gasket issue |
simon k wrote: Ian_B wrote: Thanks guys Will go cometic .Its bloody hard to machine the pistons to get deck clearance once they are pressed on the rods lol. nahhhh mate, just put them at TDC and run a rasp over the lot Isn't a belt sander a better option? |
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| Author: | simon k [ Sun Nov 25, 2018 12:37 pm ] |
| Post subject: | Re: Head gasket issue |
peterb wrote: simon k wrote: Ian_B wrote: Thanks guys Will go cometic .Its bloody hard to machine the pistons to get deck clearance once they are pressed on the rods lol. nahhhh mate, just put them at TDC and run a rasp over the lot Isn't a belt sander a better option? fwoar, that's a sh*t hot idea - I can hold the sander in one hand and my beer in the other |
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