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Torque sequence ---------------- | 9 3 1 6 8 | | 7 5 2 4 10 | ---------------- Step 1: Torque in sequence 22 Ft/Lbs Step 2: Torque in sequence 58 Ft/Lbs Step 3: Loosen all bolts completely Step 4: Retorque all bolts in sequence 22 Ft/Lbs Step 5: Retorque all bolts in sequence 54-61 Ft/Lbs recheck final torque in sequence *** CAUTION *** engine uses Torque To Yield head bolts (TTY) that permanently stretch during the initial installation. New head bolts must be used when cylinder head is replaced or re-installed to obtain proper torque.
Jul 1, 2009 - 14 posts - 5 authors
1986 Nissan 720 King Cab with 2.4 Naps Z engine (Carb based) ... Just yesterday it made a real weird loud panging noise (Kind of ... If you dont surface the head it will usually form better to the bad block deck giving you as much as another 100k !!!!!!!! before it ... Also the z24 HATES head gasket coating.
Nov 17, 2009 - 14 posts - 6 authors
I am new to this forum along with Datsun/Nissan trucks. ... doing a lot of reading and trying to become more familiar with the Nissan 720 /z24 engine. ... also if the mixture is out of adjustment it can cause the same symtoms also.the ... Listen near the back of the carb and you should hear a light clicking sound.
valve clearance is .014 inch for intake and exhaust with engine warm.
head torque it 21 ftlbs, then 44 ftlbs, then loosen all, torque to 89 inchlbs, then to 21ftlbs, then mark and turn the bolts an additional 60 to 65 degrees.
cyl head sub bolts torque 80 to 100 inchlbs.
heinrichkemp: The engine in your car is a GA16i
I venture you are asking about the head bolts when you refer to torque settings. The head bolts used on this motor are torque to yield (streach bolts) If you are reusing them, you need to check them to insure they are not stretched beyond limits.
The way you measure the bolt is with a micrometer.
Measuring close to the end where the bolt starts to thread in, about 10-12 threads up, take a reading. Now, go to the other end of the bolt where the threads end and measure about 10 threads in.
There should not be more than a .009 inch difference (.228mm). If there is, discard the bold and get a new one.
You must use a sequence to tighten the bolts, below is the sequence.
13 9 3 1 6 8
14 7 5 2 4 10
torque 11,12,13,14 & 15 to 8.3 Nm (6.1 ft lbs)
Torque the main head bolts by the numbered sequence to
29Nm (22 ft lbs) first pull
64Nm (47 ft lbs) second pull
Loosten all the bolts completely
Tighten the to 29Nm (22 ft lbs) first pull
Tighten bolt # 1 clockwise 85 degrees
Tighten bolts #2- 10 65 degrees
Nissan noted that if you do not have a torque angel meter, you can use a regular torque wrench and torque all the bolts to 69Nm (51 ft lbs)
The valves on this engine have hydraulic lifters, consequently require no adjustment.