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Frog Johnson
 Post subject: Grub screws in head
PostPosted: Thu Aug 05, 2021 11:39 pm 
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848cc
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Joined: Sat Feb 03, 2018 8:09 pm
Posts: 28
Hi all, As the title suggests, there are 4 grub screws in my cylinder head and I don’t know why.
There is another bigger one at the heater end as well.
Any thoughts on what this is all about?


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murty
 Post subject: Re: Grub screws in head
PostPosted: Fri Aug 06, 2021 4:30 am 
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848cc
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Joined: Mon Mar 09, 2020 8:06 pm
Posts: 22
Location: California, USA
Air injection ports I believe for emissions.

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- 1968 Australian Mk1 Morris Mini (originally a MiniMatic but a previous owner converted it to a 1275 and rod change box)
- 1964 Lotus 23B
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drmini in aust
 Post subject: Re: Grub screws in head
PostPosted: Fri Aug 06, 2021 12:06 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
As above, were air injection ports. Thread is 7/16 UNF, I use old seat belt bolts and cut them off flush.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Frog Johnson
 Post subject: Re: Grub screws in head
PostPosted: Fri Aug 06, 2021 10:50 pm 
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848cc
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Joined: Sat Feb 03, 2018 8:09 pm
Posts: 28
Thanks for the replies. I like your suggestion doc
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drmini in aust
 Post subject: Re: Grub screws in head
PostPosted: Mon Aug 09, 2021 12:31 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
Just grind those ones flush. A lick of paint and you won't notice them.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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