| Author | Message | ||
     Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 1 Registered: 12-2003 |
Hello everyone, long-time reader first-time poster. My 98 Disco has given me 75k relatively trouble-free miles since new. That is until today, we started the old girl up today and heard this wicked knocking from the motor. So looks like an engine transplant my be in order. So I'm looking for place to source a long/short block and I can sway my FI and accessories over to. I'd rather have a new unit if possible. Thanks for the help in advance! -Shannon | ||
| charles pastrano (Charles) Senior Member Username: Charles Post Number: 338 Registered: 08-2002 |
Are you sure an engine? Does the knocking go away after awhile? | ||
| Pugsly (Pugsly) Member Username: Pugsly Post Number: 242 Registered: 11-2002 |
Take it to Luke at Roverclubhouse in Durham and let him diagnose it. Don't assume the engine is shot until you get a good independent LR mechanic to check it out. | ||
| Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 2 Registered: 12-2003 |
Charles, Well I've been doing a little research and I listened to it again (after I calmed down a little) it actually sounds like a lifter or a loose rocker arm.. is this a common problem? Yes it goes away after about 3-4 minutes. The old girl is going to the shop tomorrow to get the final word anyway, I was just trying to get my ducks in a row if I need to replace the engine. Thanks, Shannon | ||
| Justin Sherfy (Jrsherfy) New Member Username: Jrsherfy Post Number: 24 Registered: 08-2003 |
Shannon, Would you please let us know what the diagnosis is? I'd like to hear what they think is wrong. Thanks. JRS | ||
| charles pastrano (Charles) Senior Member Username: Charles Post Number: 340 Registered: 08-2002 |
Do you do regular oil maintenance? I change oil every 3k and substitute a quart of rislone for a quart of oil. Over 150k and running strong. I dont think you have a problem. | ||
| Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 3 Registered: 12-2003 |
The truck has never missed a dealer service. BUT, I have decided to switch to synthetic oil every 3k miles. Thanks, Shannon | ||
| eric johnson (Eric2) Member Username: Eric2 Post Number: 162 Registered: 05-2003 |
I had a bad rocker arm. The loud click/knock didn't go away. A sticky lifter might go away, but 3-4 minutes? Might be the infamous sticking exhaust valve. | ||
| Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 4 Registered: 12-2003 |
Nice... that would make my day. -Shannon | ||
| charles pastrano (Charles) Senior Member Username: Charles Post Number: 342 Registered: 08-2002 |
You should be ok. | ||
| Joseph Bilyk (Denverrover) Member Username: Denverrover Post Number: 112 Registered: 02-2003 |
Sounds like sticking valve. | ||
| Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 5 Registered: 12-2003 |
Well the dealer called me late this-afternoon and said that they thought the noise was caused by "sludge build-up". They said they flushed the motor (with what??), filled her up with oil and the knocking is gone. Hmmm, it sometimes that easy? I dunno, I've rebuilt a few engines myself and I've never heard a knock like that being cured by new oil. Does the aluminum block tend to amplify noises like that? Thanks for the help, Shannon | ||
| charles pastrano (Charles) Senior Member Username: Charles Post Number: 343 Registered: 08-2002 |
Yes it is that easy. This is why I use the rislone. You might have to do another flush in 10k. | ||
| eric johnson (Eric2) Member Username: Eric2 Post Number: 163 Registered: 05-2003 |
The truck has never missed a dealer service. BUT, I have decided to switch to synthetic oil every 3k miles. Thanks, Shannon Shannon, SO this means you've been running dino oil in the engine up to 75K miles, and now have decided to switch to synth? What is the dealer service interval for changing oil - 7500K miles? If so, do you know what brand of oil they were using? That explains your problem. If you have sludge in the upper parts of the engine, there is a good probability there is sludge in the pan. If you're going to switch to synth., remove the pan and clean the layer of sludge out. Or your oil will start to look dirty again at the first fill-up. At just over 2X the milage you have, I had almost a 1/4" of gunk in my pan. | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 1174 Registered: 09-2002 |
FWIW - whenever I hear my '96 D1 tapping after the cold start in the morning, I know that it's time for an oil change. When I use 5W50, the tapping goes away immediately, if it's 20W50, it takes a couple of days' driving for lifters to clean up. I only use synthetic, and the oil change intervals are about 4-5 kmi apart. | ||
| Shannon Muncy (Shannm2) New Member Username: Shannm2 Post Number: 6 Registered: 12-2003 |
My wife picked the Disco up today, she said it was purring like a kitten... Thanks for all the advice, it's been an education. -Shannon |
