Join Date: May 2003
Location: Colorado Springs, CO!!!
Peter - What is the reason for Grade 8 bolts on a water pump?
I am not trying to be a PITA or diss your thread. I will be assembling my new engine VERY soon and am asking for a reason. If there is a compelling reason, I will buy a set of these bolts!
If I remember correctly, the bolt "grade" just determines tensile or breaking strength. We should never have to apply enough torque to exceed the breaking strength of a stock grade 5 bolt. I would assume that excessive tightening of a grade 8 bolt would crack/break the water pump housing if tightened too much.
I can see replacing the stock bolts with grade 8 bolts if you just want to replace them, but I don't know if it would gain you anything.
Is there any additional corrosion resistivity? I would assume that only stainless would do that.
Please let me know.
Project ZZombie - Sold - 2/21/14. Will find a new project in the near future...