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Discussion:

Nissan k-25 engine specs

Number of messages: 12

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jorgepinto
santiago, Chile

hi there am jorge from chile,am in the process to rebuild a k-25 nissan engine,and am looking for someone to help me ,i need the torques of this engine,rods,main cap, etc all of them,any help will be apreciated.
thanks and my best regards from the last country of the world

Posted 29 Feb 2012 02:59 AM

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REPLIES:

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mrfixit
New York, United States

main   65 ft. lbs.
rod      24
head   68

Posted 29 Feb 2012 06:03 AM

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Jplayer
North Carolina, United States

connecting rod nuts:31.4-37.3N.m (3.2-3.81kg-m)
crankshaft main caps:83.4-93.2 N.m (8.51-9.51 kgf-m)
headbolts: 68.6 N.m (7.0kgf-m) with a max of 90 - 92 after breakin if performing a retightening

word of caution though
there is a special sequence to torquing down the head which requires you to torque to certain specs, loosen and retorque in stages. There are 5 steps to this process to insure you get a good even seal on the head and to help prevent warping.

You really should use the tightening sequence instructions in the service manual to save yourself some headaches.

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Modified 7 Mar 2012 05:14 PM
by poster.

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carlos_dp
SP, Brazil

Jplayer, could you give more details about this 5 steps of loosen and retorque?

Posted 10 Apr 2013 02:10 AM

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L1ftmech
Tennessee, United States

Beware!  The 90 to 92 value given in step 5 IS NOT a torque wrench value, it is an angular value of 90 degrees to 92 degrees of arc  using an angle measuring wrench or a common protractor.
The basic sequence for the tightening of the head bolts is as follows.
Oil the threads of the bolt and the underside of the cap of the bolt.  Tighten bolts in sequence specified in manual.
Step 1, Tighten all head bolts to 19.6 to 23.52 Newton meters.
Step 2,  Tighten all head bolts to 68.6 Newton meters.
Step 3, Loosen all head bolts completely.
Step 4, Tighten all head bolts to 19.6 to 23.52 Newton meters.
Step 5, Tighten all head bolts 90 to 92 degrees of arc from the position set in Step 4
This was paraphrased from the Nissan shop manual for K-21, K-25 engines.

Posted 10 Apr 2013 09:41 AM

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Jplayer
North Carolina, United States

thanks L1ftmech

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Posted 10 Apr 2013 10:22 AM

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carlos_dp
SP, Brazil

Thanks, L1ftmech, this is more or less the same procedure that we use in Mitsubishi 4G64. However, in 4G64 we repeat step 4 twice (90 ⁰ and then another 90⁰).
Don't You think that 23.52 N.m + 90⁰ is a small torque?
Should we replace the head bolts every time we replace gasket?

Posted 10 Apr 2013 11:31 AM

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L1ftmech
Tennessee, United States

Carlos, I expect that 90 degrees should put the final torque value very close to the 68.6 Newton meters attained in Step2.
Consider that the head gasket has already been "squashed out" significantly in the earlier Steps 1 & 2 and that means that very little (if any) additional flattening and spreading of the gasket will occur in the re-tighten process.
Usually if the bolts are deemed as "Torque To Yield" type fasteners the OEM mandates new bolts be used in head and/or gasket replacement.
I do not see Nissan making bold statements in the manual to use new bolts every time.
My position on that is to replace bolts that show any pitting or rust/corrosion or other obvious defects but reuse them if they pass inspection.
Bolts labeled as Torque To Yield get replaced without even considering them for reuse.
By the way, Steps 3, 4, & 5 are actually supposed to be done AFTER running the engine to operating temperature and then allowing it to cool. But we don't and I actually think very few people bother to do that.

Modified 10 Apr 2013 12:05 AM
by poster.

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7777
New York, United States

Hello jorgepinto, email?

-------------------------
thanks for the assistance. JCFORKLIFT@gmail.COM

Posted 10 Apr 2013 07:31 PM

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swoop223
North Carolina, United States

also mentioned in the manual is to use a lubricant on the threads of the bolts and a nice caution message at the bottom of the paragraph about using an angle wrench service tool or protractor to make sure you get the 90-92 deg exact. Do not estimate the angle. So we can safely assume that they know the last torque value achieved on this last step, they just simply dont bother to just say what it is? A wild guess it would be around 51 ft-lbs? ;o) Yet another note above the caution about the angle wrench stating 51 ft-lbs can be used in step 5 as shown in the diagram figure for service.

-------------------------
You've been swooped!
swoop223@gmail.com

Modified 10 Apr 2013 08:40 PM
by poster.

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carlos_dp
SP, Brazil

I wonder why, does the manual suggest to use a 90⁰ torque at the 5 step, instead of 51 ft. It will probably give the same torqueâ€¦

Posted 10 Apr 2013 11:11 PM

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Jplayer
North Carolina, United States

hehe yep swoop, sometimes those engineers just have a problem coming out and just saying it, they have to make it difficult .....

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Modified 17 Apr 2013 06:33 AM
by poster.

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