First, I am not trying to restart a battle that has clearly raged on the forum for some time, I am searching for engineering/mechanical information. If you don't know facts and are just spewing an anti-2.7 mantra, please do not reply as I have no desire to be the starter of more bad feelings.
We own all DC vehicles including a 94 Trep which is by far our favorite (and we have found if you maintain them, they last well). I have been looking at newer treps and (like many others) have noticed a fair number with the 2.7L engines pretty cheap (many bad/knocking engines).
Reviewing old threads (and sifting through the vents), it seems that the most common cause is the crank bearings which then cause the knock but there was also discussion of oil pumps and timing chains. I have no problem pulling an engine and rebuilding it or replacing it (if I can find a decent one and know how to keep it running) but I am really searching for information regarding what the failure mechanism actually is. If I rebuild it with new bearings, what else should I expect to need to do to make the engine stable? We would probably ultimately sell our 94 Trep as this would be its replacement and as it has been very reliable, I don't want to replace it with something that is not.
Can we please try to keep this civil????
Last edited by ladelberg; 10-30-2003 at 03:03 PM..
The '00 2.7 that I am most familiar with (mine) stretched a cam chain and proceeded to take out chain guide rails and break teeth on waterpump drive gear and cam gears. That was the first major malfunction. That was repaired. The second major malfunction was bearing related. I still haven't done the autopsy
to be specific about the type of bearing prob- crank, rod or what.
Yes, a used DC rent (PROGRAM CAR)with 28k miles. failure at 72k miles..
No rants- Just facts...
A couple things to consider...with ANY motor like the 2.7. First of all, it's not a "freewheeling" motor, meaning that if the timing chain goes, you WILL push valves into the pistons.
If you spin a bearing, it's most likely fixable with minimal cost of possibly some machine work and bearings. But with the timing chain issue, you're looking at a lot more expense due to the mandatory head & piston work in addition to the timing chain, tensioner, etc...
Personally, I have 113k miles on my 99 Trep, with no problems. I will be chainging out my timing components, water pump, and oil pump this coming spring as a preventative measure since they really are way past their regular service life. If you don't want to worry about the timing issues, look for a 3.2 or 3.5 equiped Trep...they ARE a freewheeling motor, so they don't have the same "catastrophic" issue as the 2.7 as far as the timing components go.
By the way...there are a LOT more 2.7 Trep's out there than the others, so that's possibly why you have heard more about it's problems...and why they are less expensive to buy... Hope this helps...
2.7's are tough to rebuild. Most rebuild shops will not touch them. I would look for a 2000+ engine(If you can find one). The combination of a cheap bad motor car and a used engine could get you some wheels for very little money. Maybe find a 3.2 or 3.5 and use that, they seem to sell for much less money than a 2.7
I bought my 2001 2.7 3 years ago with 48K miles on it and just traded it last week with just shy of 98K on it. Other than normal stuff like oil changes, this is all I ever did on it:
New tires last May
New pads and rotors on all four corners last July
New belts and one idler pulley last May
New plugs about 2 years ago
New oil pressure switch and vent wire about 6 months after I bought it to cure the oil light flicker.
New pcv hoses a few months ago.
That is basically it. Still ran like a top. I traded it because of a really good deal on a Saturn and that I didn't want to be the one sinking money into it for timing chain and water pump when the time came.
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There was a change in the type of crank shaft bearing material used some time after 2000. If you look at the Jasper Engines site (jasperengines.com) they give you some good information on what things are common failures and what they have done to update them.
The real bottom line on the 2.7 is if you take good care of it, it will run as long as the rest of them. My 99 (bought new) and babied all of its life with regular synthetic oil every 5k miles is still doing nicely with 120k miles. Its been a pretty trouble free and reliable car (compared to the POS Ford Taurus it replaced) that is relatively easy to work on - I do all of the routine stuff myself.