Question about Boating
lookdone ahundred of them o never went by book always on a nissan torque to 40 in center stagger pattern then 80 done any trouble while on job let kme know hey if u dont mind vote for me on fixya
Posted on May 24, 2009
The aluminum heads on a cast iron block require some gentle torque procedures.... It may not be necessary - but I suggest that you start near the center of the head and work out with each tightening step. This will ensure that you don't put too much pressure on a single portion of the head. The standard proceedure for the 3.8 V6 up until 1994 is as follows:
You will have some long and some shorter head bolts. Place a small mark on the long bolts to identify them during the final torque proceedure.
Step 1: 15 (on all bolts)
Step 2: 29 (on all bolts)
Step 3: 37 (on all bolts)
Step 4: Now, starting near the center of the head, loosen a single head bolt about 2 turns. Now, torque it down to about 15 (+/- 3 lbs) IF A LONG BOLT.
OR 11 (+/- 3 lbs) IF A SHORT BOLT.
After all bolts are set as described above, ....go over them 1 more time, starting near the center of the head and pull each bolt down another 1/4 turn (90 degrees).
You are done!!
Posted on Oct 10, 2009
How are you going to know which bolts are which in their numbering? Go to an auto parts store and get a Haynes Manual for the car. All of the specs will be in there.
Posted on Oct 31, 2013
Many torque specs can be transposed. the key is to know what other similar models are there. A torque speck is the safe limit to witch to tighten a bolt. so if you can find the similar torque on a similar engine that does not seem too high I would start there. if it is an all cast iron engine I would try 95 foot LBS but is it is Aluminum I probably would not go over 25. Just saying. the torque is also directly related to the compression of the engine and the compression is directly related to the octane required, if you are not required to burn high octane then you have a low compression engine and most likely a low torque speck and if it is an aluminum head and block the very more likely very low torque.
best of luck
Posted on Apr 12, 2015
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