Engine Break-in Procedure
Posted: Fri Jan 27, 2017 10:41 am
Hi all,
I searched the forums quite a bit to find this info (that I'm pretty sure is here), without success. Should make a good How-To thread... I'm sure there is very useful collective experience out there to be added to what may have been printed in a manual...
In my case, I am getting ready to fire and break-in a total (stock) rebuild. Perhaps this thread can be split in two for 'total rebuild' and 'freshened'? (I.e.: If only connecting rod, piston and rings are changed, perhaps break-in procedure need not be as comprehensive...?) Might need a third section for non-stock (hopped-up) rebuilds?
Everyone seems to have their favourite oil recommendation, so I wasn't going to go there... (For the record, I am using Walmart SAE40 detergent-free oil.)
I seem to recall a procedure such as 'run 5mins while adjusting carb; change oil; re-torque head bolts; run 10mins fluctuating engine speed; change oil; run 10mins under load (driving around); re-torque head bolts'.
I torqued the head bolts to 25ft/lbs, and was planning to add 1-2 ft/lbs every time I re-torque... Bad idea? (Spec is 25-30ft/lbs.)
Thank-you in advance for your collective wisdom,
I searched the forums quite a bit to find this info (that I'm pretty sure is here), without success. Should make a good How-To thread... I'm sure there is very useful collective experience out there to be added to what may have been printed in a manual...
In my case, I am getting ready to fire and break-in a total (stock) rebuild. Perhaps this thread can be split in two for 'total rebuild' and 'freshened'? (I.e.: If only connecting rod, piston and rings are changed, perhaps break-in procedure need not be as comprehensive...?) Might need a third section for non-stock (hopped-up) rebuilds?
Everyone seems to have their favourite oil recommendation, so I wasn't going to go there... (For the record, I am using Walmart SAE40 detergent-free oil.)
I seem to recall a procedure such as 'run 5mins while adjusting carb; change oil; re-torque head bolts; run 10mins fluctuating engine speed; change oil; run 10mins under load (driving around); re-torque head bolts'.
I torqued the head bolts to 25ft/lbs, and was planning to add 1-2 ft/lbs every time I re-torque... Bad idea? (Spec is 25-30ft/lbs.)
Thank-you in advance for your collective wisdom,