My mom passed away and I was gifted a 2002 Hyundai Sonata, it pretty much sat in the garage for 2 years. Long story short the timing belt slipped at 65,000 miles.

Bent all the valves etc..etc.

I had all the machine work done and valves replaced, when it came time to torque the head on I couldn't find the spec, yes I bought new head bolts so anyway I just did the chevy spec and the gasket failed badly.

I found specs tore the engine back down and did a 45, then loosen, back down to 15 lbs then a 90 degree turn after. All seemed to be fine. Now at 800 miles the number 4 cylinder is failing.

Help !

45 ft-lbs

loosen(how much?)

15 ft-lbs

90 degrees(no torque spec?)



That still doesn't sound like much but I've never dealt with a Hyundai before. Where did you get the specs?



Is the block iron? I'd assume so.



You probably warped the head with the first attempt
 

I'm a Hyundai tech.  Here are the specs (I'm assuming 2.4L engine) from our service website.



So, to translate the "krengrish" as our teachers call it:
46 ft.lbs.
Back off all bolts
14 ft.lbs.
90 degrees
90 degrees

You also need to make sure you are following the proper sequence to avoid warpage.  When you remove the head again, I would check it for flatness before reinstalling.

Hope this helps.  Let me know if you need anything else.

Yes I forgot to mention that, it's a 2.4 liter engine. So I missed one 90 degree turn on the bolts, Damn. I did follow the sequence in the manual but the damn thing was very vague on the torque value's.

I don't get the 90 and 90 deal thing, why don't they specify a final torque value ?

Thanks Much war for the info, I'll have the head checked and get new bolts again.

The 90 degrees is due to the bolts being "torque to yield".  They stretch as they are tightened.  You may not have to replace them again.  Here is the spec on the bolt length.

Check and measure the length of each head bolt.
Maximum length : 99.4 mm (3.9 in.)

If they are under that length, then you can re-use them.  Hope that helps save you a few bucks.

war86, where is the bolt measured from ?

I just got the head back from the machine shop, how lucky am I. Turns out the head was not decked and 3 of the 4 cylinders would not hold vacuum, the employee that did the work originally was fired.

They still charged me another 155.00 to get it right and another 56.00 for new bolts.

OAL on the new bolts are 109.6 mm / 4.31 inches

Thats a little over the 99.4

Wrong headbolts ?