Polaris Discussions about Polaris ATVs.

850 torque specs needed

Old May 10, 2009 | 08:16 PM
  #11  
WOLF1's Avatar
Thread Starter
|
Range Rover
Joined: Sep 2008
Posts: 188
Likes: 0
From: Rigby, Idaho
Default

Originally Posted by HIGHOCTANE
Ok...so far not impressed with the Polaris service manual,I've found a few discrepancies,and some, like this one are biggies..
There is a TQ chart in the begining of the Engine section that shows the TQ as 26ft lbs+ 90* for the head bolts...but the actual text procedure shows 43.5 ft lbs+90*??
It doesn't say what size the bolts are so you will have to use you judgement on that one. It may be obvious that one or the other is right....43.5+90* sounds reasonable for head bolts but it's hard to say without knowing what size they are.
Anyway here is the basic procedure...
The 6 main head bolts are wet torqued. Install the 6 main bolts finger tight then install the 2 outer 6mm bolts. Then,get this,you tighten the 6 main bolts snug,lol..no kidding that is what it says.. Then tighen them to 43.5ft lbs(59Nm) Then the next round is an additional 90*..sounds like you need new bolts huh? Even though the manual doesn't say that..
The TQ for the 2 small bolts is apparently standard TQ which is 72-78 inch lbs.
Sequence is:
Intake side
4---2---6
5---1---3
Exhaust side

Camshaft sproket bolt is 28ft lbs..says to tq after you install the chaing tensioner..
Thermostat 89 in lbs
Valve cover 89 in lbs..
IAFM is 18in lbs then 89 in lbs..
Any new info on the torque discrepancies out there yet?
I will be assembling this thing tomorrow. Big difference in 26 ft lbs + 90 degrees and 43.5 ft lbs + 90.
 
Reply
Old May 11, 2009 | 07:13 AM
  #12  
Kerbbirds's Avatar
Pro Rider
Joined: Jun 2005
Posts: 2,343
Likes: 0
Default

Go with the 43 + 90 degree, they increased the torque on the heads a couple years ago cause they were losing head gaskets,they sent a service bullitin to the dealers.Why do you have a new 850 apart already?
 
Reply
Old May 11, 2009 | 10:34 AM
  #13  
WOLF1's Avatar
Thread Starter
|
Range Rover
Joined: Sep 2008
Posts: 188
Likes: 0
From: Rigby, Idaho
Default

Modifications.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Hankey Pankey
Polaris Ask an Expert! In fond memory of Old Polaris Tech.
26
Oct 18, 2020 03:50 PM
jayking232003
Polaris
16
Dec 4, 2019 09:38 AM
jrooker6
Ask the Editor
11
Apr 21, 2016 07:35 PM
Dieseltrash
Suzuki
3
Jun 6, 2015 09:53 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread

All times are GMT -5. The time now is 05:09 AM.