| Author | Message | ||
     Dave (Discoverover) Member Username: Discoverover Post Number: 55 Registered: 11-2002 |
Have you ever found cylinder linings/sleeves set down below the surface of the block -maybe 1mm below the surface. They should be flush, but I am very interested in knowing if this is common. My block had one cylinder lining set deeper on the end of one of the banks. I am very curious to know if this has been found before on other rovers and how the engine lasted. Thank you for your help. Dave | ||
| eric johnson (Eric2) New Member Username: Eric2 Post Number: 15 Registered: 05-2003 |
Not an engine builder, but it does happen to other engines. Seems pretty rare though. If by "lasted", you are asking are they rebuilt with the defect corrected and how long before they explode? Ask J. Robison, here or the R.N. board. | ||
| Dave (Discoverover) Member Username: Discoverover Post Number: 56 Registered: 11-2002 |
Right, I want to know how many have seen this and have left it alone. The cylinder lining is pressed in until it hits stops in the cylinder and then the block is machined flat so the block and liners are flush. If one is lower than the block and the block has not cracked, then it must have come from the factory with this defect. For a liner to drop during the vehicles use after it was built, the stops/block would have to crack or the crankshaft would grind the liner up. My engine ran perfectly with one cylinder liner 1mm down. I think it was a defect from the factory and the liner was not sliding around in the cylinder. Now, if it were an inch down I would certainly have a problem, but I think that 1mm should be okay for the life of the engine, or it is worth a shot. I am trying my best to understand this, I'm not a mechanic. Has anyone here found this in their block, and how did you deal with it? I am very curious. Thanks, Dave Crall Jr. | ||
| Ron L (Ronl) Member Username: Ronl Post Number: 93 Registered: 11-2002 |
can you post a pic? | ||
| Dave (Discoverover) Member Username: Discoverover Post Number: 57 Registered: 11-2002 |
No, I'm not sure if I can get the original block back yet. I have a new block in but its running poorly. One of the cylinder liners was just about 1mm down from the surface. I'll look for a picture. | ||
| Dave (Discoverover) Member Username: Discoverover Post Number: 58 Registered: 11-2002 |
Here is a picture of cylinder liners.  | ||
| Ron Brown (Ron) Senior Member Username: Ron Post Number: 378 Registered: 04-2001 |
If it drops AT ALL it is junk. They can be relinered but it is not satisfactory in my opinion, some vendors of "rebuilt" engines see it otherwise. Dropping a liner is common on rover blocks, sometimes they drop a little, sometimes they drop all the way and break the top of the piston off. Ron | ||
| Shaun Power (Shaunp) New Member Username: Shaunp Post Number: 18 Registered: 05-2003 |
It's a common fault on 4.6 engines not so common on 3.5, 3.9 and 4.0L they sometimes drop and cause a knocking noise and loose coolant. The way to fix them is to instal stepped liners and they never do it again.The stepped liner have a lip on the top which stops them moving. It's common for liners to move if the engine has been hot as they are only an interferance fit. This fault does not effect the 4.4 P76 blocks. | ||
| Paul T. Schram (Paulschram) Senior Member Username: Paulschram Post Number: 1546 Registered: 02-2002 |
The number three cylinder on 3.9s and 4.0s is notorious for dropping the sleeve. If you've ever overheated one of these engines badly, you will find almost invariably that the gasket between cylinders 3 and 5 has been compromised. It is also common for the exhaust valve guides for those cylinders to fall under the same conditions. Junk that block. Peace, Paul | ||
| todd slater (Toddslater) Senior Member Username: Toddslater Post Number: 296 Registered: 08-2002 |
Shaun, What does it cost to have your block re-sleeved with the stepped liners ? Just curious. | ||
| Shaun Power (Shaunp) New Member Username: Shaunp Post Number: 20 Registered: 05-2003 |
Tod depends if you want to do all bores or just the crook one. I haven't had one done for some time,but in general the liners were less $100 "Aus" each plus fitting. So at a guess $1k "AUS" all up. The last Jag I did cost about $700 all up. Jag Xk blocks also have loose liner problems and crack between the bores if you get them hot. Normal liners are an interferance fit, this means the liner is bigger then the hole in the block, but if the block over heats the hole gets bigger an lets the liner move. General rule of thumb for interferance fit is 1 thou + a thou for every inch of diameter. So if you have a 4in liner the fit in the block will be 5-6 thou. You heat the block and fit a cold liner when the block cools the liner wont move, in theory. It is also posible to repair cracks prior to fitting the new liners, by welding,stitching or plugging. As for valve guides that are loose in the head, over size units are available to restore the fit. | ||
| Greg Hirst (Gregh) Member Username: Gregh Post Number: 206 Registered: 10-2002 |
Shaun is right. Here in Socal it runs $80-100 per hole (although I haven't priced it recently). Find a shop that is experienced in resleeving (i.e. common prob in Cadillac alu V8's). Original Buick 215 had cast-in liners. After Rover started production they went to pressed-in. Good luck- | ||
| todd slater (Toddslater) Senior Member Username: Toddslater Post Number: 297 Registered: 08-2002 |
I was just wondering the $$ you guys ran into to do this as of late. Quite a few years ago I had a historically significant and correct 289 hp block stitched and sleeved at a shop in Baltimore I'm thinking it was ~`$500 back then. Looks like it would be double that now. Even at the time it would have been far cheaper for me to get a recon block...but I spent the money due to the history of the motor. | ||
| Ron L (Ronl) Member Username: Ronl Post Number: 95 Registered: 11-2002 |
Dave, The cylinder thats sunk, does it look like there are any machine marks as a result of the original surfacing of the block? Or does the top of the liner have a near perfect finish to it. Most high performance machine shops and large engine rebuilders have the proper tooling to press in another sleeve. The cleaner you bring the block into them the cheaper it is. Peace Ron | ||
| Dave (Discoverover) Member Username: Discoverover Post Number: 59 Registered: 11-2002 |
Ron, I think this sleeve was not pressed completely to its stops in the cylinder when the engine was built, so it was machined flat like all the others, but naturally was pushed to its stops when the engine was running leaving a 1 mm gap above it. I can't believe they would build an engine with a short sleeve. Thanks for the advice, Dave |
