aross2566 Posted June 17, 2008 Report Share Posted June 17, 2008 Hello Everyone.. My sister is putting another motor in her 1998 Deville. It has the n* motor in it. The car is in great shape with only 67000 on it. I have read on here, but can't find it now, that some recommend changing some under the hood parts while the motor is out. Can anyone give me a list to give her. Thanks for all the input in advance. Link to comment Share on other sites More sharing options...
lothos Posted June 17, 2008 Report Share Posted June 17, 2008 When the motor is out I've read it's a good time to replace the oil pan gasket. Also the material on the firewall that gets brittle and cracks and breaks off would be easy to replace with the motor out. That's what I've gathered from reading posts on the forum, I'm sure there's more that I'm forgetting and I'll let others chime in with suggestions. WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 17, 2008 Report Share Posted June 17, 2008 If it were me, I would change the following pan gasket ISS sensor (in side pan if tranny is out) Pressure Solenoid (in side pan if tranny is out) TCC Solenoid (in side pan if tranny is out) Side pan seal (in side pan if tranny is out) heater pipes HVAC cover referred to above torque converter seal output shaft seals inspect engine mounts crossover seals while the engine it out inspect oil pump for clearances That list might be overkill, but while the engine is out Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Texas Jim Posted June 18, 2008 Report Share Posted June 18, 2008 Good list. I agree and it would eliminate the.... "I wish I had replaced (insert name of part here) while the engine was out of the car." Which WILL most probably happen. At least it would to me. Just my 2 cents. Link to comment Share on other sites More sharing options...
aross2566 Posted June 18, 2008 Author Report Share Posted June 18, 2008 Thanks for all the great input. Sorry but I left some info out that might change your advice. The new motor going in is out of a 05 Deville with 42 k. The numbers match. Knowing this now,again sorry about that,would you still relace all that was listed? Link to comment Share on other sites More sharing options...
JimD Posted June 18, 2008 Report Share Posted June 18, 2008 Thanks for all the great input. Sorry but I left some info out that might change your advice. The new motor going in is out of a 05 Deville with 42 k. The numbers match. Knowing this now,again sorry about that,would you still relace all that was listed? Someone is in for a big surprise. There are so many differences between a '98 and a '05 engine that it might as well be a totally different engine altogether. The short list of differences includes; intake manifold and air control integrated MAF and IAT sensors ignition type PCM calibration to accomodate internal differences and lower compression ratio Not sure what "the numbers match" means in this case. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
aross2566 Posted June 18, 2008 Author Report Share Posted June 18, 2008 dang, sorry again. The numbers mean there is a "y" in the vin and the engine code is the same, LD8. Not totally stupid here but I though if those were the same, you could swap out the motors without a problem. Please help before my sister kills me. She hasn't purchased the motor yet. Should we stay closer to the year of the original? Link to comment Share on other sites More sharing options...
JimD Posted June 18, 2008 Report Share Posted June 18, 2008 .... Should we stay closer to the year of the original? Yes. It should be safe to limit the engine donor Deville to 1997 through 1999. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
KHE Posted June 19, 2008 Report Share Posted June 19, 2008 Out of curiousity, why is the engine being changed??? Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
aross2566 Posted June 19, 2008 Author Report Share Posted June 19, 2008 Out of curiousity, why is the engine being changed??? head bolts pulled Link to comment Share on other sites More sharing options...
MrEldo97 Posted June 19, 2008 Report Share Posted June 19, 2008 If the mechanic is COMPETENT it is best to Timesert the original block. Of course, the key word here is "COMPETENT"... Link to comment Share on other sites More sharing options...
navion Posted June 19, 2008 Report Share Posted June 19, 2008 If the mechanic is COMPETENT it is best to Timesert the original block. Of corse, the key word here is "COMPETENT"... Ancil, I think that we can rule out "competent" if your mechanic thinks that an '05 Y engine would be a direct swap out for a '98 Y engine. Possibly he is just ill informed. I agree with MrEldo97 that the best course of action would be to "timesert" your existing engine. Installing a used engine with an unknown maintenance history is asking for a repeat of the pulled head bolts, leaking head gasket problem that you now have. If the engine is otherwise OK, then do the research and get it "timeserted". If you must replace the engine, consider "timeserting" the replacement engine before you have it installed. An addition to BBF's list would be to replace the lower crankcase seals. These seals are notorious for seeping oil on the early Northstars. The lower crankcase bolts directly to the cylinder block (upper crankcase) and holds the lower half of the main bearing shells. The engine MUST be out of the car for the replacement of these seals. The oil sump (pan) bolts to the lower crankcase. When I changed the engine in my 94 SLS, I didn't replace those seals and regret it daily. Take Care, Britt Britt Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 19, 2008 Report Share Posted June 19, 2008 Britt, when the case half seal is replaced, do the main bearings need replacing? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
navion Posted June 19, 2008 Report Share Posted June 19, 2008 Britt, when the case half seal is replaced, do the main bearings need replacing? BBF, I have been told that it is not an absolute necessity, depending on their condition. But, personally, I would change them. Bearing shells are built with a "crush" which is a slight protrusion above "flush" when placed in their saddles. When the lower crankcase is assembled to the upper, the bearings in the upper crankcase and the opposing ones in the lower crankcase contact each other slightly before the case halves meet. This is where the term "crush" comes from. When the lower crankcase is torqued down, this "crush" seats the bearings firmly in their saddles. It is my opinion that bearings, once assembled will lose some of the "crush" and be more prone to movement. Any movement can eventually lead to a "spun" bearing. I want to emphasize that this is MY opinion. Even some aircraft engines allow bearings to be reused under certain situations. Take Care, Britt Britt Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 19, 2008 Report Share Posted June 19, 2008 Britt, when the case half seal is replaced, do the main bearings need replacing? BBF, I have been told that it is not an absolute necessity, depending on their condition. But, personally, I would change them. Bearing shells are built with a "crush" which is a slight protrusion above "flush" when placed in their saddles. When the lower crankcase is assembled to the upper, the bearings in the upper crankcase and the opposing ones in the lower crankcase contact each other slightly before the case halves meet. This is where the term "crush" comes from. When the lower crankcase is torqued down, this "crush" seats the bearings firmly in their saddles. It is my opinion that bearings, once assembled will lose some of the "crush" and be more prone to movement. Any movement can eventually lead to a "spun" bearing. I want to emphasize that this is MY opinion. Even some aircraft engines allow bearings to be reused under certain situations. Take Care, Britt Britt, I agree, and wanted you to elaborate on this issue. You know me, while I am there why not replace them. The CRUSH issue for me would be enough for me to replace them. (I'd replace the oil pump also while I was there, why not) Thanks Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
MrEldo97 Posted June 19, 2008 Report Share Posted June 19, 2008 I agree with everything you fellows have said. I never opened a motor without replacing mains and rods because of the crush issue. To be sure if the motor had a lot of miles then a complete rebuild was done... Link to comment Share on other sites More sharing options...
caddypete Posted June 19, 2008 Report Share Posted June 19, 2008 Why would timesert the new donor motor? or replace the case seals? After 2000 they took care of those issues. Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 19, 2008 Report Share Posted June 19, 2008 Why would timesert the new donor motor? or replace the case seals? After 2000 they took care of those issues. He needs to use a 1999 and older engine, he can't use a newer engine Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
MrEldo97 Posted June 19, 2008 Report Share Posted June 19, 2008 Why would timesert the new donor motor? or replace the case seals? After 2000 they took care of those issues. First of all; not really, second of all since the motor is on the floor and and you (your sister) is planning on driving it for quite some time spend a little extra loot and cure future problems. All Northstars with mileage leak at the case half seals and many Northstars pull headbolts. This is not the time to be C-H-E-A-P. I'm not convinced an '05 motor will work in '97. I'd cut down my chances of having these two problems a few years down the road... Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.