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L16 Broken head/block bolt?


d.p

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Noticed this bolt on the front was spinning freely so I went to hand tighten it and it sheared right off.   Not even sure what these bolts are called.  

 

Anyone ever had to drill one of these out?  If so what did you use?  Ok to drive it like this until I can get it fixed?  Looking for a replacement but no luck.  

 

32971770306_30d28a3630.jpg

 

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Part # should be 08110-62010 (right next to the timing inspection cover)

 

M6x20, thread pitch 1.0

 

I looked this up for a 510 with L16........don't have a 521 catalog.

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I can look it up but just a timing cover bolt. 10mm head, common to all L4 and L6 engines.  If it was loose then likely the aluminum threads are already stripped. If broken you would have to take the head off to really get at it. Possibly with the head off there is enough of a nub sticking up you could turn it out with vice grips.

 

These bolts only tighten a few foot pounds, like wrist tight with a spanner.

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Thanks Kelmo, but I don't think that is right.  That bolt goes on the front and the one I broke is on the top.   It was loose and it just spinning before it broke.  It must have been stipped/broken already and I was the hair.   There is a nub sticking out right now but doesn't look like enough to grab hold of.  

 

Is this what I am looking for?

 

#18.. Which I think is part 08360-61212

 

http://www.carpartsmanual.com/datsun/pickup-1965-1972/engine-1600-(l16)/cylinder-head 

 

520_001C_01.jpg

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M6-1.0, 20 MM long is a very common bolt size.  Most hardware stores will have that bolt, look for one with a 10.9 marking on the head.  Unmarked metric bolts will have no head marking, 8.8 is a weaker grade, 10.9 is a stronger grade than 8.8.

 

If it is not leaking oil, do not worry about the missing bolt.

 

You might be able to get the remaining part of the bolt to come out with a left hand drill, 1/8.   Commonly, when bolts break the head off, the tension holding the bolt tight is gone, and the remaining part screws out easily.  The bolt screws into the aluminium timing chain cover.  If you do not get the drill exactly centered on the broken bolt, and the drill wanders off to the aluminium, the drill will go into the soft aluminium, and make removing the remaining bolt way more difficult to remove.

 

But again, if it is not leaking oil, do not create more work for yourself.  

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The 08360-61212 shows to be one of those bolts that has a regular bolt head with a phillips screw head indentation.

 

M6x12x1.0

 

FWIW, I have an L16 and an L18 block in the shop, pulled this bolt on both, it is 20mm.  Also found the same bolt in the bottom of the timing cover on the drivers side of the block.

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The 08360-61212 shows to be one of those bolts that has a regular bolt head with a phillips screw head indentation.

 

M6x12x1.0

 

FWIW, I have an L16 and an L18 block in the shop, pulled this bolt on both, it is 20mm.  Also found the same bolt in the bottom of the timing cover on the drivers side of the block.

 20MM by what?  

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