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Guest Message by DevFuse

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Head Bolt Lengths

Head Bolt Length EA82

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4 replies to this topic

#1 DaveT


    Subaru Nut

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Posted 18 September 2013 - 10:00 PM

It's been a while...  Anyway,  I need to finaly put an engine back together.  Something like 10 years since I dissassembled it...  I noticed there are 2 different lengths of head bolts.  It looks like there should be 3 shorter ones in a line just under the valve springs.  Is this correct?



Back story:

I took it apart back then to do a re-seal.  It was leaking oil at a stupid rate, as is typical.  I had that engine from when it had 15,000 miles on it.  Drove it past 150,000 with synthertic oil and a bypass filter.  Never changed oil, just added as needed.  Checked a crank bearing & wrist pin, both in the best condition / original spec I've seen in the handful of engines I've rebuilt / dissassembled.  And there it has sat, parts in boxes.


Anyway, lots of other things kept me busy - like building a house - and I ended up with other spare engines, so I have not needed to re assemble it until now.


Thus I don't remember which bolts were short / long / where they were...



#2 NorthWet


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Posted 19 September 2013 - 01:45 AM

Set them in place, and it should be apparent.  For some reason, my mind says 5 of the shorter bolts, and they should fit in the recessed areas of the head (like around the valves).

#3 DaveT


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Posted 19 September 2013 - 12:00 PM

Extra bolts from another engine got mixed in.. Thus the uncertainty on quantities.

#4 MilesFox


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Posted 19 September 2013 - 12:15 PM

Presuming an ea82, the shorte bolts go in the middle, and the longer go on the perimeter. You will see the outside holes have a taller shoulder, for the longer bolts.

#5 DaveT


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Posted 19 September 2013 - 08:15 PM

Looks like 3 short + 6 long then.  I have to look around more.   I don't have enough short bolts.   Nuts.

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