Restore oil treatment blows head gasket
#81
![Default](/forum/images/icons/icon1.gif)
![Big Grin](https://www.jaguarforums.com/forum/images/smilies/biggrin.gif)
#83
#84
#85
#86
#87
![Default](/forum/images/icons/icon1.gif)
one word, threadlock
as dsnyder says keep going. Heat is a good way to break down the threadlock but keep in mind the rubber part of the damper pulley, I've used a small butane torch directly on the bolt head and a wet towel on the pulley, this is stage 2 work....gotta be accurate and keep testing the bolt
as dsnyder says keep going. Heat is a good way to break down the threadlock but keep in mind the rubber part of the damper pulley, I've used a small butane torch directly on the bolt head and a wet towel on the pulley, this is stage 2 work....gotta be accurate and keep testing the bolt
#88
![Default](/forum/images/icons/icon1.gif)
Sean, I called my old mechanic and that's exactly what he said, they used threadlock, and to apply heat. If It's a torque spec'ed fastener WHY did they do that, I hate thread lock, Loctite have so many different variations that don't lock the threads but provide anti vibration assistance and will allow a bolt to unscrew.
So another mechanic friend suggested spraying carb cleaner on the bolt as this might dissolve the threadlocker, so spray wait 5 minutes apply 6 point impact socket an a 24" breaker bar and the handle off my floor jack for a combined 44" of leverage (4" in the handle) it started to move, no drama no bang just slowly giving way to brute force.
I AM SO RELIEVED.
got the bolt out, how did this damage happen, on the end of the thread?
![](https://www.jaguarforums.com/forum/attachments/xj-xj8-xjr-x308-27/31188-restore-oil-treatment-blows-head-gasket-roger77-13105-albums-garage-fast-paws-4014-picture-crank-bolt-16902.jpg?dateline=1359067315)
Onward to the cams.. I'M SO WORRIED
So another mechanic friend suggested spraying carb cleaner on the bolt as this might dissolve the threadlocker, so spray wait 5 minutes apply 6 point impact socket an a 24" breaker bar and the handle off my floor jack for a combined 44" of leverage (4" in the handle) it started to move, no drama no bang just slowly giving way to brute force.
I AM SO RELIEVED.
got the bolt out, how did this damage happen, on the end of the thread?
![](https://www.jaguarforums.com/forum/attachments/xj-xj8-xjr-x308-27/31188-restore-oil-treatment-blows-head-gasket-roger77-13105-albums-garage-fast-paws-4014-picture-crank-bolt-16902.jpg?dateline=1359067315)
Onward to the cams.. I'M SO WORRIED
Last edited by Roger77; 01-24-2013 at 04:41 PM.
#89
#90
![Default](/forum/images/icons/icon1.gif)
![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
BTW, without a impact wrench ... sometimes sudden heaves on the bar works a lot better than steady pressure. Especially on smaller fasteners in the range suited for a 3/8 square drive.
#91
#93
![Default](/forum/images/icons/icon1.gif)
I digress, but the thread's about Jaguar engines, I love them.
Family member.....dry sump....
Last edited by Sean B; 01-25-2013 at 05:09 AM.
#94
#95
![Default](/forum/images/icons/icon1.gif)
Flat plane cranks are available for the AJ-V8....I'm hunting for one to go in a manual XKR...I've also got a flat plane crank TWR 7lt V12 engine that may go into an XJ coupe, if I can find a rust free example....
I digress, but the thread's about Jaguar engines, I love them.
Family member.....dry sump....
Aston Martin V8 Vantage Loud Exhaust Sound! - YouTube
I digress, but the thread's about Jaguar engines, I love them.
Family member.....dry sump....
Aston Martin V8 Vantage Loud Exhaust Sound! - YouTube
#96
![Default](/forum/images/icons/icon1.gif)
When you put it all back together with clean parts, cleaned bolt threads & a knowledge of how everything now fits together, then the re-assembly will fly by...
When I did the head gaskets on my Bentley last year, it took me a full week before the first head came off as I was cleaning & storing everything on the way, then decoking the piston crowns & cylinder heads etc.
Re-assembly was easier & flew by in about 3 days for both heads...
The following users liked this post:
Roger77 (01-25-2013)
#97
![Default](/forum/images/icons/icon1.gif)
Would you need to change the camshafts when changing to a flat plane crank? The cam lobes will be in the position to open/close valves at the piston positions produced by a cross plane crank with 90 degree throws, rather than the piston positions produced by the 180 degree throws of a flat plane crank.
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
#98
![Default](/forum/images/icons/icon1.gif)
Yep. I know the difference
The ideal would be a complete 4.7 unit, but Douglas Valley wanted the same money I could buy an XKR for, so parts are being sought. I contacted a tremendous engineering company on the Wirral about custom cams, reground an profiled to the crank, just a case of working with a degree wheel to set-up. Might even be the cheaper option, and I can add my own dwell for the twin screw set-up, but I don't want to to give too much away...
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
Would be worth changing the diff too, as there's not much headroom in the standard unit.
I'm on the Wirral...
#99
![Default](/forum/images/icons/icon1.gif)
I guess you'll get to know the level of knowledge I've gained with these cars at some point. There isn't a nut or bolt I've not considered. I enjoy sharing some of it
![Wink](https://www.jaguarforums.com/forum/images/smilies/wink.gif)
#100
![Default](/forum/images/icons/icon1.gif)
I'm after the ultimate R. Done LSD conversions on them too - you don't have to inform me of that... if you look back over the threads that you found this out...
I guess you'll get to know the level of knowledge I've gained with these cars at some point. There isn't a nut or bolt I've not considered. I enjoy sharing some of it![Wink](https://www.jaguarforums.com/forum/images/smilies/wink.gif)
I guess you'll get to know the level of knowledge I've gained with these cars at some point. There isn't a nut or bolt I've not considered. I enjoy sharing some of it
![Wink](https://www.jaguarforums.com/forum/images/smilies/wink.gif)
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)