-
1.9 cap bolts
by
mercedesjones
on 30 Sep, 2006 08:43
-
Can someone confirm if the cap bolts for mains and rods are stretch bolts and have to be replaced if removed? If so, can I still plastiguage with the new bolts and re-use them as long as the engine wasn't run?
Thx.
-
#1
by
935racer
on 30 Sep, 2006 09:34
-
Which engine and which year are you reffering too?
-
#2
by
mercedesjones
on 30 Sep, 2006 10:19
-
1.9 aaz
Thx.
-
#3
by
935racer
on 30 Sep, 2006 10:33
-
Need to know which year, call your local vw dealer with the engine year and serial # of your car and they will tell you. Or if you have the old bolts take a look at them, if they are a fully threaded shank they are stretch bolts, replace them, If they are only half threaded shank you can reuse them.
-
#4
by
QuickTD
on 30 Sep, 2006 15:50
-
The rod bolts are always stretch type but there are 2 different kinds based on year. The early rods had locating pins in the caps and took a normal looking bolt. They are about $12 each. The later engines don't have locating pins in the rod caps, they use a ground portion on the shank of the bolt to locate the cap. Oddly enough they're the cheap ones at $3-4. Both types can be torqued to the first stage for checking clearance. As long as you don't put the 90º turn on them they do not stretch and may be reused. Of course, you must put the 90º turn on them during final assembly.
Like 935 said, the main cap bolts are either all thread or partial thread. the partial thread ones are not stretch bolts and can be reused. The all thread stretch bolts can be torqued to the first stage for clearance checking.
-
#5
by
mercedesjones
on 06 Oct, 2006 12:40
-
Just picked up the rod and main cap bolts from the dealer. $70 - OUCH!
I can't see a diff in length btwn old and new. Do stretch bolts return to their original length when not under torque? Or did I spend $$ for natta. The mains are threaded up to the bolt head btw.
-
#6
by
jtanguay
on 06 Oct, 2006 15:53
-
the bolts shouldn't stretch... i believe just the threads 'stretch'.
-
#7
by
mercedesjones
on 07 Oct, 2006 08:47
-
Right, thanks. Can someone tell me the correct torque specs for the mains and cons on this bottom end? 1995 1.9td. Thanks.
-
#8
by
HarryMann
on 07 Oct, 2006 17:52
-
When they say 'stretch' bolts, it means the bolt is taken through elastic deformation limit to an estimated but small permanent strain. This might be 1, 2 or just a few % plastic strain. You'd hardly be seeing this, though it could be measured (if you had measured those original bolts first).
Will try to dig out thsoe figures unless someone else does first, but they do vary a bit by year. Had a hell of a job finding the right big end shells and bolts for my AAZ, think there is more than a single year split in thes engines' bottom ends, could be wrong though.
-
#9
by
andy2
on 08 Oct, 2006 16:15
-
As per Bentley:
Main bearing cap bolts
-new type bolt (replacment) with fully threaded shank tighten to 65 Nm (48 ft-lbs) plus 1/4 turn (90*).Note: do not reuse this type of bolt!
-old type bolt with partially threaded shank tighten to 65 Nm (48 ft-lbs).This type of bolt can be reused.
-do not mix old and new type bolts!
connecting rod bolt
-streach bolt-always replace
-oil threads and bolt head surface during installation
-AAZ and AAA engines:tighten to 30 Nm (22ft-lbs) plus 1/4 turn (90*).