Jan Olsson Posted May 12, 2005 Report Share Posted May 12, 2005 Not to start another debait here again but since I´m going to timesert my Northstar this summer (because I have to remove the head to fix the low compression problem on the no 1 cylinder) some questions came up. I´m going to use timeserts because its proven to be a solid repair but why are they better than the helicoils? The helicoils have a larger outer diameter than the initial thread (like the timeserts) so they are stronger than the initial ones in that aspect but obviously the don´t work, but why? I meen helicoils are to be used for thread repairs in the rest of the car? Can I trust helicoil in other applications using steel/aluminium? Just to make me sleep better tonight Link to comment Share on other sites More sharing options...
JasonA Posted May 12, 2005 Report Share Posted May 12, 2005 I understand the Helicoils are too short (in length) for the Northstar head bolt thread repair. The Timeserts are the correct (longer) length. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
KHE Posted May 12, 2005 Report Share Posted May 12, 2005 The timeserts are also a continuous piece unlike the helicoils which look like square stock wound around an arbor. The continuous threaded bushing is much stronger than the helicoil. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Cad1 Posted May 12, 2005 Report Share Posted May 12, 2005 Didn't realize what a helicoil was... Just another name for tapping. 92 Deville w/210k miles Link to comment Share on other sites More sharing options...
JasonA Posted May 12, 2005 Report Share Posted May 12, 2005 A Helicoil IS a thread insert, like a Timesert. However, the Timesert is the correct part to use with a Northstar (or even a 4.x) headbolt. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
KHE Posted May 12, 2005 Report Share Posted May 12, 2005 Didn't realize what a helicoil was... Just another name for tapping. No - a helicoil is a threaded insert. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Scotty Posted May 12, 2005 Report Share Posted May 12, 2005 What are the specific advantages of TIME-SERT over Helicoil? The TIME-SERT inserts have a flange, which will give them a positive placement on installation, for “accurate specific depths”. This ensures that the insert does not wind down into the threaded hole. TIME-SERTs are solid bushing and self locking, TIME-SERT being a solid bushing insert gives it added strength. TIME-SERTs have no messy prongs to break off down in the hole which can be a problem in deep holes. TIME-SERTs are self-locking having an actual locking feature which will prevent them coming out when a bolt is removed, again adding to the advantages over coil types. TIME-SERTs are timed internal to external, which give them a thin wall for tight applications but added strength over the coil styles, and can also use loc-tite, if so desired. See this link http://www.guzzitech.com/Timesert-ed.html Link to comment Share on other sites More sharing options...
Cad1 Posted May 12, 2005 Report Share Posted May 12, 2005 Thanks for clearing that up. 92 Deville w/210k miles Link to comment Share on other sites More sharing options...
Jan Olsson Posted May 12, 2005 Author Report Share Posted May 12, 2005 Thanks for the input. Great explanation! Link to comment Share on other sites More sharing options...
coolnesss Posted May 13, 2005 Report Share Posted May 13, 2005 May I ask an OT idiot question? A friend has a very old Volvo with a loose spark plug - and the rumor is you don't have to take off the head to use a helicoil. Is this true? Link to comment Share on other sites More sharing options...
Ranger Posted May 13, 2005 Report Share Posted May 13, 2005 True, if the plug hole is in a position to get a tap into it. If it were up against the firewall it could be iffy. Link to comment Share on other sites More sharing options...
jhall Posted May 14, 2005 Report Share Posted May 14, 2005 Here's a good pic of why Timeserts are needed on a 4.6 when the head bolts are removed. Had at least three thread failures during removal, three more failed when installing the Timesert jig. Link to comment Share on other sites More sharing options...
coolnesss Posted May 14, 2005 Report Share Posted May 14, 2005 THANKS GUYS!!!!!! The Volvo is up for grabs, and I know a deserving kid with a new baby who needs a car bad . . . I'm gonna take a shot at it! B Link to comment Share on other sites More sharing options...
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