Zetec arp bolts for blacktop

[Molecular--Bob]

I think i may have overstreached mine 🙆🏻. I did a combination of what Raceline said in their literature, and what i have done in the past, and this doesn't agree with the ARP installation guide. ARP say 25ft/lb 3 times, Raceline say 25ft/lb stage 1 and then 32 ft/lb stage 2. I have gone with the Raceline, BUT did the 32 ft/lb 3 times, which is the usual ARP protocol.

 

Lesson learned. Never do things when tired and full of cold cure drugs. Raceline aren't picking up, and i'm thinking i should just buy more bolts and do them the ARP way. What are the collective thoughts about this?

[ECR]

Regardless of whether you've actually overstreched them, if you don't replace them you'll always worry (I would). I'd replace them and go with the ARP method.

[Molecular--Bob]

I took the sensible option and ordered new bolts. As you say, just not worth the stress.

[Guy Lowe]

I followed the Raceline guide lines, have done 8,000 miles, 6 track days, set max revs to 7,200 so when the new bolts arrive put them on eBay and go for a a good blat.

Guy

[Molecular--Bob]

Hi Guy

 

When you did yours, did you do the 25ft/lb then 32ft/lb or did you do the 25 and then 32ft/lb 3 times?

 

 

[seventh-heaven]

Can you describe exactly what you mean when you say you did 32 lb/ft 3 times? Can't currently see why that would damage the bolts!

 

Did you just check them 3 times with same setting on torque wrench or undo them and them re tighten them to 32?

[Molecular--Bob]

They were undone and re-torqued to 32ft/lb. ARP recommend that when using their assembly lube you torque to the given value 3 times, the true clamping force increasing each time, with the 3rd tightening being the correct set for the bolt.

 

Have done this on other engines and am happy with this idea, its just that 32ft/lb is ~30% over torque for this bolt.

 

Just interested why Raceline and ARP differ in their recommendation.

[Guy Lowe]

Quoting Molecular--Bob: 

Hi Guy

 

When you did yours, did you do the 25ft/lb then 32ft/lb or did you do the 25 and then 32ft/lb 3 times?

 

Bob

I did them 25 ft/lb and then 32ft/lb 3 times, although Raceline say stage 1 = 25ft/lbs then stage 2 = 32ft/lbs, Pete said it would "do no harm" to do them to 32ft/lb a couple more times. I used the ARP grease as well.

Guy.

 

[Molecular--Bob]

Thanks Guy

 

Feel a lot happier now that you have said that. It also means i can get on and put the engine in the hole, rather than waiting for the new bolts to turn up.

 

Have to say that i got around 10 degrees more turn on the wrench between 1st and 3rd tightening, so they have gone in tighter.

 

Cheers

 

Ian B.

[Guy Lowe]

Ian

Yes mine tightened some more as well, about 10/15º over the 3 tightening’s.

 

I don't know if it made any difference (probably not) but I waited about 30 minutes between tightening’s.

 

Guy