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The 100 Forum

Mystery Bolt Hole in 100 Block

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cpcooper Craig Cooper
Chico, CA, USA   USA
Anyone know what this hole is for?

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Attachments:
Mystery Hole.jpg    41.3 KB
Mystery Hole.jpg

gramos Avatar
gramos Graham Foster
Kefalonia, Greece   GRC
I am fairly sure it is for cleaning out the centre main oil galleries ,
I have just taken my engine down and there was a small bolt screwed into this hole ,
its back together now so I can,t check sorry !!

hbrand Avatar
hbrand Silver Member Harold Brandner
Edgewater, FL, USA   USA
Many times forgotten and missing screw resulting in low oil pressure.
Greetings, Harold

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Luegolover Avatar
Luegolover Steve L
London, London, UK   GBR
Oh, that's interesting. However, I have only just stuck my engine back in the car and I am not getting it out now to check. Wish I had known to look out for it earlier,......

hbrand Avatar
hbrand Silver Member Harold Brandner
Edgewater, FL, USA   USA
You only need to remove oil pan, engine will get bad if bolt is not in there
Greetings, Harold

cpcooper Craig Cooper
Chico, CA, USA   USA
I don't think so guys. It doesn't appear to go into the oil galley or any passage under oil pressure. I poked a zip-tie through it and, as you can see in the picture, it comes out the side of the block where that round maybe 1" or so plug goes beneath the tach drive on the lifter side of the block. From where the plug goes, you can look all the way through the block to where the distributor goes. So, if that were under oil pressure, so would the tach drive be and the distributor on the other side. I'll plug up the little hole with a 1/4 BSF bolt, but I'm still curious why it's there.


Attachments:
Mystery Hole 2.jpg    27.8 KB
Mystery Hole 2.jpg

PAN Avatar
PAN Alwyn Keepence
Ipswich, Queensland, Australia   AUS
G’day Craig,
According to the workshop manual, the grub screw that goes into the external hole (below the tach drive) is the oil pump retaining screw. Your experiment with the zip-tie is interesting but inconclusive.
Cheers,
Alwyn

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