Zetec is now in the Luego, went in easier than I thought (mainly due to the advice from here), but one real problem, a couple of the engine mount
holes on the block don't seem right for the M10 bolts I'm using. Bolt screws in OK but has a little play in it as it goes but when you try
to tighten up, it starts to tighten then slips, affects two of the holes out of seven, others tighten up correctly. Obviously the engine is not new so
the threads may have been damaged in the past. Any ideas of the best way to sort it, retap and bigger bolt maybe or are there self tapping bolts.
[Edited on 25/10/09 by norfolkluego]
If the block threads are damaged, best thing to do is take the engine out and get helli-calls fitted, most local engineering firms can fit them. It basically gives you a brand new thread and are very strong
If the theads are gone and you want to use the M10 you could repair them using a Helicoil see link
You can fit helicoils yourself
http://www.youtube.com/watch?v=RFYa6sjhh_E
Not bothered what bolt size I use but the Heli do-dah's sound expensive (and time consuming if the engine has to come out after a whole 24 hours)
Interesting vid but if you're going to the trouble of retapping the hole anyway why use the insert, why not retap for a bigger bolt (may be a dumb question but it's not obvious to me)
Can you tap JB weld?
You can helicoil without taking the engine out, as long as you have some free area around the hole,
i did my crossflow engine mounts and exhaust studs with the engine in the car
fiddily but easy
The vid was interesting to see how it was done, but with that amount of material round the hole, why not just tap out to the next size up?
helicoils will be much stronger than a cut thread. Just my 2p
cut threads can be pulled out easier than rolled threads and helicoils are stronger than both.
Helicoil type repair gets my vote
How much does the Helicoil cost?
quote:
Originally posted by norfolkluego
Interesting vid but if you're going to the trouble of retapping the hole anyway why use the insert, why not retap for a bigger bolt (may be a dumb question but it's not obvious to me)
quote:
Originally posted by norfolkluego
How much does the Helicoil cost?
The only thing going back on are the engine mounts and the holes/bolts in that can be sized to fit the holes in the block. I've got the drills and taps necessary and the bolts I can buy easily, is there any reason not to retap, the Helicoil may the the better solution but this is Locost and it's not the only bolt holding the engine in.
Depends how much material there is around the holes.
If there is enough I would just redrill and tap M12.
David
I'd go with the helicoil just so that all your engine mounts are m10 - never underestimate how much of a PITA it is when one bolt is different from all the others on the same component unnecessarily.
quote:
I'd go with the helicoil just so that all your engine mounts are m10 - never underestimate how much of a PITA it is when one bolt is different from all the others on the same component unnecessarily.
Tapping it out and fitting a helicoil is a better bet than tapping for 12mm . If the 12mm strips what are you going to do then? at least in the unlikely event of the helicoil failing you could then go to 12mm
quote:
Originally posted by norfolkluego
Not bothered what bolt size I use but the Heli do-dah's sound expensive (and time consuming if the engine has to come out after a whole 24 hours)
Had a look tonight, no chance of getting a drill + bit in there, could get a tap in no problem, but watching the Helicoil vid I'm going to have to drill either way, looking like engine out, groan