Torque specs required for Phoenix crank and Renault 4 rods

[John Newell]

Hi all
I'm at that point in my engine rebuild where I need to torque up the starter dog bolt and the flywheel nut.
Tomorrow I will be tightening up the big end bolts
I'm using a Phoenix pressure fed crank, and Renault 4 rods.

Can anyone please help me with the required torque settings for these fasteners?

Google has suggested between 25 and 30 ft-lbs for the rods.
Phoenix has come back saying he thinks 100 ft-lbs may be correct for the flywheel nut.

I have no answers for the starter dog bolt, nor any idea if the above figures are correct.

Its been a while since I have been A7 Friends and its great to see the more modern forum bulletin board in use.

Looking forward to some informed replies
Regards
John
Christchurch
New Zealand

[Charles P]

Hi all
I'm at that point in my engine rebuild where I need to toque up the starter dog bolt and the flywheel nut.
Tomorrow I will be tightening up the big end bolts
I'm using a Phoenix pressure fed crank, and Renault 4 rods.

Can anyone please help me with the required torque settings for these fasteners?

Google has suggested between 25 and 30 ft-lbs for the rods.
Phoenix has come back saying he thinks 100 ft-lbs may be correct for the flywheel nut.

I have no answers for the starter dog bolt, nor any idea if the above figures are correct.

Its been a while since I have been A7 Friends and its great to see the more modern forum bulletin board in use.

Looking forward to some informed replies
Regards
John
Christchurch
New Zealand

Johns

Can't help you with the R4 rods but my flywheel is tightened to "very bloody tight". My torque wrench reads up to 150ftlb and it's tighter than that. I subscribe to the "leave off the locking tab washer" school of thought because it's softer than the nut or flywheel and may "give". Just Loctite. 
I've never seen a torque figure for the starter dog but again "very tight" works for me. I use a lock washer here. 

Charles

[John Newell]

Hi all
I'm at that point in my engine rebuild where I need to toque up the starter dog bolt and the flywheel nut.
Tomorrow I will be tightening up the big end bolts
I'm using a Phoenix pressure fed crank, and Renault 4 rods.

Can anyone please help me with the required torque settings for these fasteners?

Google has suggested between 25 and 30 ft-lbs for the rods.
Phoenix has come back saying he thinks 100 ft-lbs may be correct for the flywheel nut.

I have no answers for the starter dog bolt, nor any idea if the above figures are correct.

Its been a while since I have been A7 Friends and its great to see the more modern forum bulletin board in use.

Looking forward to some informed replies
Regards
John
Christchurch
New Zealand

Johns

Can't help you with the R4 rods but my flywheel is tightened to "very bloody tight". My torque wrench reads up to 150ftlb and it's tighter than that. I subscribe to the "leave off the locking tab washer" school of thought because it's softer than the nut or flywheel and may "give". Just Loctite. 
I've never seen a torque figure for the starter dog but again "very tight" works for me. I use a lock washer here. 

Charles

Thanks Charles
I too don't like the idea of tab-washers. I do use 243 Loctite to act as a secondary retention method on important fasteners.
Useful to know that you tighten above 150 ft-lbs.
If any ones else has some figures I would appreciate this.

Cheers
John

[Ian Williams]

I do Phoenix rods to 35 ft lbs and flywheels to at least 125 ft lbs no washer

[Tom the Blacksmith]

I too tighten Phoenix rods to 35 ft lb and the flywheel to 150 ft lb. The 150 figure was reached by incrementally going up and checking with slips til the flywheel stopped creeping up (no tab washer but 243 instead).

Tom

[Bob Culver]

In light of the small recip weight with Seven, and that 5/16 bolts are used on much larger engines, and that 35 lbft on 5/16 or 8mm produces more tension than same on 3/8 then 35 lb ft seems a formidable tension, more suited to 3/8 very HT. Cars with heavy rods and pistons which run beyond 5000 rpm manage with 20 lbs ft on 5/16. With the vagaries of torque is there not a big risk of snapping on assembly ?

[Ian Williams]

None whatsoever with ARP bolts Bob, it is the recommended torque for them, I would not suggest anyone tries this with std 5/16" bolts on Austin rods.

[John Newell]

Great news re the 150 ft-lbs measured against slips.  Useful real data.

I usually fit tapered joints with hot, with the female piece not only lapped on, but also heated. This way the joint really locks on. When I removed the flywheel 2 months ago it took lots of force to pull off , and then really came off with a bang. I do the same with halfshafts, and although I push hard with driving tests and trials, have not had an issue since 1993 and an Edinburg Trial.

As said above, my rods are Renault 4.
Any idea on the factory spec torque for their big end bolts? They are not ARP bolts.

Cheers John

[Terrytuned]

Factory spec torque for R4 big end bolts 26 ft-lbs. As they were frequently over tightened it wise to replace them Renault P/no 7700509393 sold as single bolts.
Terry.

[John Newell]

Factory spec torque for R4 big end bolts 26 ft-lbs.  As they were frequently over tightened it wise to replace them Renault P/no 7700509393 sold as single bolts.
                                                                                                                                                                                                                                       Terry.

That is great to get the torque and the  bolt part number. Thanks.

Now to find a place that sells such bolts.
Anyone know of an online sales place?
I highly doubt the NZ Renault agents would have ever stocked these. There were very few ever here and I think most were private imports.