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Discussion Starter · #101 ·
Automotive tire Fluid Liquid Automotive exterior Bumper

I spent the day cleaning engine parts. This is before.

Wood Bumper Automotive tire Gas Auto part

This is after. I figure I have two more days of Xylene and popsicle sticks to look forward to.
 

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Discussion Starter · #102 ·
Musical instrument Household hardware Wood Gas Auto part

The engine is inverted. The oil pump is off and I'm staring at these 12-point external torx-type bolts. What is the correct socket for this fastener.

Gas Fluid Liquid Circle Metal

An E16 socket fits but is only 6-point. A 12-point 10mm and a 6-point 11mm fit but they both seem wrong.

Automotive tire Camera accessory Cylinder Font Gas

I can get a set of spline sockets but they don't seem right either. I don't want mess up these bolt heads.
 

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I don't think that's an "external torx" fastener - torx have a curve between the points (clearly visible in your image) - those fasteners have a clearly defined groove.
 

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Max beat me to it, standard 12 point socket
 

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Discussion Starter · #107 ·
Thanks to all who posted.
Tool Font Auto part Electric blue Automotive wheel system

I am now 99% certain the bolt head on my engine is a 12mm triple-square bit.

Office supplies Font Cylinder Metal Fashion accessory

I am less certain this is the socket that fits it but it is the closest thing I've found so far.
 

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Discussion Starter · #108 · (Edited)
Further research revealed the triple-square is a German fastener and is not used on Japanese vehicles.
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To resolve the issue I took a hi-res photo of my engine bolt and estimated the facet angle. It's definitely not triple-square. If you said 12-point "double hex," you nailed it. Now that I know I don't need a special tool I should have these bolts out tomorrow.
 

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Triple square are definitely on Mercedes and Audi and are a real pain. Like most European engines, they are the same ........but different
Whole new toolbox required
At least the Japanese use metric standardized fasteners on the majority of things.
 

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Are you replacing or in any way disrupting the Timing Chain components? :unsure:

IF so, don't miss the two-part assist sourced from the FAQ thread...

 

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Discussion Starter · #111 ·
Musical instrument Engineering Machine Auto part Metal

Thank you to everyone who helped me get this engine apart.

Motor vehicle Crankset Gear Automotive tire Bicycle part

All that disassembly just to just to replace this O-ring.


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I heard it snap when I lifted it out. It may have been rubber at one time but it's hard plastic now.
 

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Use a Nitrile/Viton "O" ring as replacement., or Silicone "O" which has a higher heat tolerance..
 
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