Just servicing Sonic and I want to check the tappet gaps. The engine is an Rover cooper A+ 1275 with a 1 inch & 3/4 HIF6 carby (as standard), what gaps should I set
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| Author: | Kennomini [ Sat Apr 11, 2009 5:09 pm ] |
| Post subject: | tappet gaps |
Just servicing Sonic and I want to check the tappet gaps. The engine is an Rover cooper A+ 1275 with a 1 inch & 3/4 HIF6 carby (as standard), what gaps should I set
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| Author: | 74snail [ Sat Apr 11, 2009 5:25 pm ] |
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You will need a 7/16" spanner , flat blade screwdriver and a .012" feeler guage. I just had mine adjusted to help the " Snail " run better, my brother did them, I was the one rocking the car in gear to find TDC and BOS . I,m sure there are other people here who could give you more detailed information. ( Yes I should of mentioned that this was on an 1100, of course a 1275 would be different ! ) 
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| Author: | TheMiniMan [ Sat Apr 11, 2009 5:30 pm ] |
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Kenno,,, being a 1275 it will probably have 5/16ths rocker nuts/bolts,,, therfor you`ll want a 1/2inch spanner & the later mini engines usually are meant to be set at 15thou clearance,,, set when engine is cold |
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| Author: | gafmo [ Sat Apr 11, 2009 8:07 pm ] |
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yep when the engine is cold Take the spark plugs out (Helps with the rocking) 14/15/16 thou clearance http://www.ausmini.com/forums/viewtopic.php?t=10528 |
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| Author: | david rosenthal [ Sat Apr 11, 2009 9:41 pm ] |
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How much wear is in the rocker face? If you use a feeler guage it will give bigger clearance if the face is worn. I set mine using a dial indicator and turning the eng over slowly in direction of rotation |
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| Author: | Kennomini [ Sun Apr 12, 2009 12:22 pm ] |
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Yeah I've heard that's a much more accurate way of setting it all up but I don't have a dial gauge so I'll just hope their not too bad 
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| Author: | justfanginaround [ Sun Apr 12, 2009 6:09 pm ] |
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it all depends on what cam you have my 1275ls runs 16 inlet 18 exhaust Fang runs 28 inlet and 32 exhaust and the 998 on the floor runs 14 inlet and 16 exhaust |
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| Author: | miniron [ Mon Apr 13, 2009 1:06 pm ] |
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It also depends on the rocker arm ratio as well as the cam. The higher the rocker arm ratio the more clearance you need for the same cam. The lever ratio principle applies here. The rocker clearance is all about how much quietening ramp is built into the cam profile and to provide some clearance when hot to avoid the valve starting to open due to expansion of the engine bits when hot. The quietening ramp takes up the clearance slowly to avoid noise and sudden impact loads on the cam lobe before the lobe actually starts to open the valve. Thats why you have to use a different clearance when checking the actual valve opening and closing angles. On some BMC cams its (IIRC) 0.021" for checking valve timing, rather than the cold running clearance of 0.012" or 0.015". RonR |
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| Author: | drmini in aust [ Mon Apr 13, 2009 1:08 pm ] |
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For a Russell Engineering RE13 cam (probably the most common regrind round here now) the clearance is .016" with stock rockers, or .019" with 1.5s. Same clearances apply to most Kent cams- MD266, 276 etc. |
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| Author: | Kennomini [ Sat Sep 12, 2009 10:14 am ] |
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Just checking what is 15-thou in mm? |
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| Author: | wild_willy [ Sat Sep 12, 2009 10:38 am ] |
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.015 inch = 0.38099999999999995 mm |
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