mad_pete Posted May 5, 2007 Share Posted May 5, 2007 One of the power steer pump bracket bolts that goes through the timing case into the block won't bite. Does that mean the thread is shot ? and does anybodyknow what thread it is please ? It's a long 13 mm bolt. Engine is 4.2 V8. Thanks. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted May 5, 2007 Share Posted May 5, 2007 M8 coarse thread. Les. Quote Link to comment Share on other sites More sharing options...
pugwash Posted May 5, 2007 Share Posted May 5, 2007 it is extremely easy to strip threads in a v8 block with steel fasteners. An old block like yours will also suffer terribly from seized bolts- if for example a previous owner snapped a bolt just as it entered the block then they may well have drilled it out (seems quite a common way of removing stuck fasteners- can't stand it as a seized fastener removal method myself). Both of these factors may mean that the thread is totally stripped- however i would suggest that you make sure you are using the correct bolts- i thought i had the same problem as you and spent ages buying helicoils (and asking people how to use them) only to find i was using a short bolt and not a long bolt! if you have stripped the thread then yhour only real answer is to fit Helicoils. Please do not glue them in with something like liquid metal or similar as they are a nightmare to fix later on and can't be tightened once the glue has hardened. Quote Link to comment Share on other sites More sharing options...
Jon White Posted May 5, 2007 Share Posted May 5, 2007 M8 coarse thread.Les. M8 course thread??????? Er I dont think so!!! You've been sniffing round oil burners for too long Les! 5/16" UNC is what you want - V8's are pretty much all UNC! Cheers Jon Quote Link to comment Share on other sites More sharing options...
mad_pete Posted May 6, 2007 Author Share Posted May 6, 2007 I think the thread is damaged not totally stripped as judging by the hole there is another 3/4" left fo the bolt to go. So hopefully only top couple of threads are damaged ( based on scientific method of sticking bolt in hole and then sticking wire in hole and comparing lengths ) Quote Link to comment Share on other sites More sharing options...
Jon White Posted May 6, 2007 Share Posted May 6, 2007 try re-tapping it then. Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted May 6, 2007 Share Posted May 6, 2007 If its one of the long bolts, then the thread will need to be repaired as those clamp the water passage from the pump………… the bolts normally corrode if water and not coolant has been used in the system for any length of time. Yes, the thread is 5/16 UNC ……………… Ian Quote Link to comment Share on other sites More sharing options...
Les Henson Posted May 6, 2007 Share Posted May 6, 2007 Sorry about that - I could have sworn it was M8. Wrist duly slapped. Les. Quote Link to comment Share on other sites More sharing options...
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