 how much to torque heat exchanger to the motor?, need others specs too... |
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| opera guy |
 Sep 24 2004, 08:16 PM
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#1
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Member  Group: Members Posts: 337 Joined: 28-June 04 From: upland, ca Member No.: 2,268  |
got no manual so i cant RTFM (read the fXXking manual)...
how much to torque the heat exchanger to the motor? how much to torque the heat exchanger to the muffler? gf prayed, so i didnt strip any heat xchanger studs, whew. thought i "one oomph'd" it, but it's still leaking. so i need the proper specs. also, how much to torque the nut on the valve? (as per valve adjustment) thanks car's coming back together |
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| MXMARK |
Sep 24 2004, 10:52 PM
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#2
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Member Group: Members Posts: 205 Joined: 15-February 04 From: Riverside, Ca. the new (951) Member No.: 1,656 |
Opera guy, I have a manual if you want to borrow it. Most 8 mn nuts are torqued to 14.5 lb ft in my manual but I know to watch out on the exhaust studs. The other 8 mm bolts could be up to 18 but maybe 14.5 would be better. I never read the torque on the nuts for the vavles. I just tighten to what I think will hold them. Maybe 12-14 ft lbs. I hope this helps. Again I have been wrong before. Mark
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| opera guy |
Sep 25 2004, 12:10 AM
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#3
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Member Group: Members Posts: 337 Joined: 28-June 04 From: upland, ca Member No.: 2,268 |
actually, the heat exchanger nuts are 13 and 14mm. they all have same inner threading or whatever, but the outside of the nuts.. some are 13mm and some are 14mm.
dude, mark, i know corona boy's (aaron) been on my case about going for a run one of these days.. this is what im waiting on. as soon as this stuff is taken care of, i should be able to do get out and do one with y'all. |
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| bob91403 |
Sep 25 2004, 01:31 AM
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#4
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Senior Member Group: Members Posts: 618 Joined: 15-September 04 From: Los Angeles, CA Member No.: 2,763 |
Everything I've come across says 12 to 17lbs., no more than it takes to make them stop leaking. Did you put new sealing rings in? Do you have SS heat exchangers? When I asked my renouned 914 mechanic about SS heat exchangers, he told me, forget it. He said he never saw a set made well enough not to leak.
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| michelko |
Sep 25 2004, 02:21 AM
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#5
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Senior Member Group: Members Posts: 867 Joined: 30-November 03 From: Germany, Lambsheim Member No.: 1,404 Region Association: None |
check this out :
http://www.tunacan.net/t4/reference/torque.htm very informative site!! (IMG:style_emoticons/default/smilie_flagge6.gif) |
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| scotty914 |
Sep 25 2004, 04:06 AM
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#6
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suby torque rules Group: Members Posts: 1,528 Joined: 20-July 03 From: maryland, the land of 25 year Member No.: 924 |
two tricks to help heat exchangers to seal :
one take the sealing rings, hang them on a peice of wire and heat em with your propane torch till they are red hot then drop them in to a bucket of water. this will soften them so they deform to the head and heaters with less chance of striping the heads. they will work harden with the temp increase and decrease of the head. two take a long file that will span both inlets of the exchangers at the same time. then just file both surfaces at the same time till they are even and flat with each other. this gives you a good start so you dont have to try to crank them even. scott thacher 75 someday suby power conversion will be completed (IMG:style_emoticons/default/driving-girl.gif) |
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| rhodyguy |
Sep 25 2004, 09:19 AM
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#7
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,252 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
it sounds like you are using the old nuts. a BIG no no. get new ones. did you get new copper rings? are they the correct ones? there are ones for 2.0 and ones for 1.7/1.8. the 14mm can be somewhat tight to get a 3/8" drive socket up there. i use a 1/4" drive socket, thinner walls. before you torque, push the he up and just barely start the nuts. now push the he up tight and and start to tighten the nuts in a cross pattern. take them up in 3 tightening cycles. most times if you run one up tight, you won't be able to get a tight seal from the pipes to the heads. make sure the seating surface in the head is clean.
kevin |
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| bob91403 |
Sep 25 2004, 03:17 PM
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#8
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Senior Member Group: Members Posts: 618 Joined: 15-September 04 From: Los Angeles, CA Member No.: 2,763 |
QUOTE(michelko @ Sep 25 2004, 12:21 AM) check this out : http://www.tunacan.net/t4/reference/torque.htm very informative site!! (IMG:style_emoticons/default/smilie_flagge6.gif) Thanks, only place I've seen with an actual list. Of course you don't know where he got the info. |
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| Ray Warren |
Sep 25 2004, 03:21 PM
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#9
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Member Group: Benefactors Posts: 415 Joined: 1-October 03 From: Canada Member No.: 1,214 Region Association: None  |
QUOTE(bob91403 @ Sep 25 2004, 04:17 PM) QUOTE(michelko @ Sep 25 2004, 12:21 AM) check this out : http://www.tunacan.net/t4/reference/torque.htm very informative site!! (IMG:style_emoticons/default/smilie_flagge6.gif) Thanks, only place I've seen with an actual list. Of course you don't know where he got the info. I think you can trust this information without any hesitation. |
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| bob91403 |
Sep 25 2004, 03:51 PM
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#10
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Senior Member Group: Members Posts: 618 Joined: 15-September 04 From: Los Angeles, CA Member No.: 2,763 |
QUOTE(914ray @ Sep 25 2004, 01:21 PM) QUOTE(bob91403 @ Sep 25 2004, 04:17 PM) QUOTE(michelko @ Sep 25 2004, 12:21 AM) check this out : http://www.tunacan.net/t4/reference/torque.htm very informative site!! (IMG:style_emoticons/default/smilie_flagge6.gif) Thanks, only place I've seen with an actual list. Of course you don't know where he got the info. I think you can trust this information without any hesitation. No doubt. Looking at his site further leads me to believe he's done extensive research on the subject. This guy knows his stuff. |
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| bob91403 |
Sep 25 2004, 04:31 PM
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#11
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Senior Member Group: Members Posts: 618 Joined: 15-September 04 From: Los Angeles, CA Member No.: 2,763 |
Before you put them back on go to www.casperlabs.com/casperlabsinc/id1.html They offer an exhaust stud kit that is well worth a look. Their page takes forever to load. Be patient, it's worth it.
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| Uraquan |
Jan 30 2026, 12:23 PM
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#12
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Newbie Group: Members Posts: 4 Joined: 22-March 19 From: Atlanta, GA Member No.: 22,981 Region Association: South East States 
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QUOTE(bob91403 @ Sep 25 2004, 05:31 PM)  Before you put them back on go to www.casperlabs.com/casperlabsinc/id1.html They offer an exhaust stud kit that is well worth a look. Their page takes forever to load. Be patient, it's worth it. Looks like http://www.tunacan.net/t4/reference/torque.htm has expired. I've attached a screen shot from the wayback machine for anybody else that finds this thread Attached thumbnail(s) 
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| JeffBowlsby |
Jan 30 2026, 01:28 PM
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#13
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,168 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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My engine builder says 14 ft-lbs heat exch to head is sufficient. Used this for years with no issues. Def not a nut to overtighten.
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