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Discussion Starter · #1 ·
I'm looking at finding a replacement for the Cam Cover Phillips head bolts...

Here's what Ive found...flanged button bolt M6 X 1.0 X 20mm

Can someone confirm the specs are correct??

I will measure the OEM Phillips head bolts once I take one off my 5MGE....

Product Household hardware Line Automotive tire Font
 

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Hi Arch,

Sorry for the delay, but here goes:

Font Household hardware Cylinder Technology Ink

23.5mm long body
15mm long threaded portion
5.91mm thread peak-to-peak
28.9mm length from the top of the screw head to the very end of the threads

Hand tool Household hardware Tool Office ruler Gas

1.0mm thread pitch

Automotive tire Household hardware Gas Screw Composite material

17.4mm Head Diameter
Slight rebate inboard of the edge to help seal against the rubber insert on the Cam Cover Seal.

Wood Art Sculpture Flooring Artifact

#3 Phillips Head
#2 Phillips will work, but push like crazy on it while turning. Otherwise it will cam out of the head.

Okay, I have OCD.

Dale
 

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Has anyone tried JIS bits instead of the #3 phillips?
It's funny that you mention that. Phillips don't feel quite right so I was trying Pozidriv.

Pozidriv is a European variant of the Phillips that is designed to prevent the driver flutes from riding out (or camming) of the slots in the head of the screw.

There appear to be 2 major differences between the two types.

Bicycle part Arthropod Electric blue Natural material Automotive exterior

Phillips #1 Screwdriver
The width of the flutes of the blade appear to have a distinct wedge shape to them. (middle lines)
The flutes are quite 'pointed' so they enter the hole in the screw head easily.

Insect Arthropod Feather Invertebrate Bait

#1 Pozidriv Screwdriver
The width of the flutes of the blade appear to be parallel to each other (middle lines)
The flutes are not as pointed so the blades have more surface area that reaches down into the head of the screw. As a result you can apply more force.

My pictures are not great, but below is a much larger #3 Pozidriv that more easily shows the flute shape


Wood Tints and shades Bumper Landscape Soil

#3 Pozidriv Screwdriver

I can really believe that the Japanese used a different profile that is 'close, but not the same'.
However, I started looking for JIS screwdrivers and found this article that says they are probably no longer made.

webbikeworld.com article on JIS Screwdrivers

bikegremlin.com article on Phillips, JIS, and Pozidriv Screwdrivers

Apparently, the JIS standard is obsolete!
It sounds like Phillips and JIS screwdrivers have both changed somewhat to be better in both applications, but it is a trial and error search to find out which screwdrivers work better.

Who knew that finding a screwdriver could be such a pain in the butt!

Dale
 
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Discussion Starter · #6 ·
Dale and Gamble Nice Work!!!

I use my good ole Craftsman #2 but I hit the screwdriver with a framing hammer before turning...
 

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Discussion Starter · #7 ·
Now based on Dale specs I might have to go steel to get the head diameter close to OEM...
 

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The JIS bits work much better if you're working on imports. I bought a set of bits of Amazon for a few bucks. JIS isn't made to cam out when over torqued vs phillips (US standard) is meant to do by design.
 
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I don't like Phillips heads! I went with SS allen head bolts. Takes a 4 mm allen driver. Looks /works fine.
 
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I bought a set of JIS type Phillips screwdrivers and am impressed.
I don't really know if it's because they are brand new or that they are JIS style, but they work extremely well without camming out of the screw heads.
I removed a set of the cam cover screws off of a motor sitting for 20 years and I had to really torque on them. The JIS screwdrivers worked really well. #3 was the perfect size.

Thank you Gamble. I would have never thought about these drivers

JDV Produts - Vessel JIS Drivers

They were expensive but they are very nice.
They have a solid steel shaft so one can actually hammer on them. As a result, they have great weight.
And the name: well..... Vessel Megadora. I'm pretty sure that's a monster that destroyed Tokyo.......

Office supplies Writing implement Tool Office instrument Writing instrument accessory



Font Line Office supplies Tool Writing implement


I wasn't sure about this, but the ribs aren't obvious or excessive.
 
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Discussion Starter · #11 ·

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Discussion Starter · #12 ·
I think I will order this 5 pc set with the P2 and P3 Impacta versions for $59.99
 
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