It started like thisQuote:
Originally Posted by wyll
Dear roverlordoffroadspares,
Hi, These head bolt's are of very poor quality. After fitting with new head gasket's and re tensioning the vehicle travelled only 150 km before blowing the gasket's between every cylinder and the water jacket's.
Once pulled down again it has become obvious the leaking is due to the head bolt's as the release tension varied between 40-70nm, the block deck surface and cylinder head's are still within warp tolerance. If you do not refund my money or send replacement head bolt's I will purchase more from your store just to leave you with negative feedback!
Thankyou!
Dear ******,
Hi , 1stly your threat at the end of your message is not really called for, we pride ourselves in customer service and quality products and are quite insulted.
There is a way to talk to people. The bolts are very good quality Land Rover mechanics use the same bolts. Thousand of these bolts have been purchased from our supplier and never in history have had a bother.
What method of tensioning did you use? tension to degrees or just torque wrench settings, they are bolts torque to yield , meaning they are 1stly torqued to a set Tension then an Angle gauge is used and the further tightening is does in degree stages. Also what Head gasket did you use? was it Elring or some other brand? I suggest you look into the method of installation used and the head gasket quality before assuming it is the Bolts that have failed.
Torque to yield bolts do not require retensioning and are not designed to ,so why did you add more stress to the bolts by retensioning? this is probably where the failure has occurred as you have disturbed them after initial fitting WHERE THEY ARE STRECTHED TO SPECS.
Dear roverlordoffroadspares,
Elring head gaskets were used, The cylinder heads were machined and the block was machined as the engine was fully rebuilt. The head bolt's were tightened to a total value of 90nm which is per manufacturers specification's with a snap on digitech tension wrench in the appropriate sequence, after start up and running to temperature the bolt's were then checked of tension 2 were at 85nm and the rest were still at 90nm. this is standard practice for a Mechanic! after an hour of driving the engine failed. When pulling the engine apart it was obviously the bolts as 12 out of 20 were loose and they all show significant stretching above the top thread's which is not normal for any headbolt!
Thankyou!
Dear *******,
Hi, as per Land Rover specifications, here is the Land Rover Technicians workshop manual instructions for Land Rover V8 Heads for Discovery.
It depends on the suffix of engine, early 14 bolt and the later 10 bolts, the 10 bolt is done with a dial gauge to degrees,. There is no mention of
re tightening after,.
see attached extract.
Regards, Mario
Dear roverlordoffroadspares,
Note the suffix b part mate, This engine has no suffix therefore is required to be tensioned to 90nm not 20nm + 2 stages of 90' okay!
Thankyou!
Dear *****,
Look if you want help then provide the engine number we are trying to resolve and help, if you have this attitude. then forget it.
- roverlordoffroadspares
Dear ******,
Ok, the problem is you have used these bolts which are torque to yeild bolts... meaning they are tensioned to then and then dial gauged 90 degrees , then 90 degrees, they are as we said Torque to yield bolts, they can not be installed by your method of torque fitting,
If you are using your method then different bolts are required that are not stretch bolts that's why they have failed.
regards, Mario
- roverlordoffroadspares
Dear roverlordoffroadspares,
Okay, well thankyou for selling and sending me the wrong bolt's and causing an engine failure! You did an excellent job. And you have fantastic Customer relations too.. I asked for Headbolt's to suit a 10 bolt 96 Discovery and that's what you sold me.
Thankyou!
Dear *****
Hang on a bit, you received the correct parts for a 10 bolt, you asked and we said yes, they will, you as a mechanic should know about what torque to yield means, if YOU had of correctly fitted them as required in the correct manner then you wouldn't of had a failure. We advertise as torque to yield every one else uses them in correct manner.
Sorry you made an incorrect installation, if you had of been nice about it in your first message instead of threats, we could have worked out something.
Yes we have very good customer service, but if it's not our fault and we are not there to supervise your mechanical ability.
regards
- roverlordoffroadspares
