Engine mount diesel/petrol?

[jazzyman]

I have had another engine mount failure this time the R/H side top (timing case end) on my Mazda 323 (Protege) 2Litre Diesel Turbo year 2000.

Mazda want silly money for this mount £180 ($288) because it's the diesel model.

I can get the petrol version from the states for 1/4 of this price. I guess that the steel bracket is different but the rubber mount seems to be the same. So any idea if they use the same rubber mount?

Here's the dimension of the diesel mount:
Centre hole is approx 20mm

http://img444.imageshack.us/img444/2544/dscn1110smallcopyxt2.jpg

[viper707]

it looks identical to the gas 2.0.. i want some more infor on the diesel though. how much hp and tq does it produce???

[Lex]

Take your failed mount and fill it with some urethane. It should fix your problem for a very modest cost.

http://www.raktron.com/misc/mt.htm

[jazzyman]

it looks identical to the gas 2.0.. i want some more infor on the diesel though. how much hp and tq does it produce???

thanks for both replies, not to sure on the urethane option does it not make the engine mount more solid and creates more vibrations might be a nightmare with a diesel engine?

Info on the diesel motor
hp - 99.00
torque - 230.00 lbs/ft

anyone able to confirm that the gas engine mount measurments matches the diesel mount?

[Goldstar]

Welcome to the Forum.

I can't tell you whether or not the CI and SI engine mounts are the same, but, in general, there is more vibration in the former engine type.

According to Isuzu, in the diesel engine the maximum cylinder pressure is considerably higher, and the pressure rise during combustion more rapid (due to the nature of the combustion process) compared with the gasoline engine, causing vibration and noise.

Additionally, reciprocating parts such as pistons and connecting rods must be heavier and the higher inertial loads also contribute to vibration.

There are ways to lessen vibration in the CI engine, including the adoption of twin counter-rotating balance shafts, but in a conventional engine vibration may still be more severe than in an equivalent SI type.

The problem is further compounded in 4-cylinder inline engines because they cannot be perfectly balanced - although the primary unbalanced force can be eliminated, the secondary force (rocking couple) cannot.

Consequently, our engines rely more on the engine mounts to control vibration than would be the case with, say, a 6-cyl inline which can be brought into perfect balance.

Happy Motoring!

[jazzyman]

thank you for your replies

one other question regarding engine mountings, on the engine crossmember where the front engine mount is attached, there is a device listed as "Damper Dynamic Mount". How does this operate? it's not attached to anything, only the crossmember.

http://img232.imageshack.us/img232/2726/mazepcrl8.gif

[zerocover]

I have the 1.6l and my car has the tendency to destroy its motor mounts. So I have a solid rubber passenger and rear mount and have filled the front mount with urethane.

The solid rubber didn't really change anything but the upgrade to urethane definitely increased the vibration. Its not over whelming so Im ok with it but I'd imagine that in a diesel it might be too much.

[jazzyman]

all of my engine mounts are now removed, mounts 1,2,3+4. It's now time to reinstall them all with a new mount for No3.
I am just wondering if there is a sequence to reinstall these mounts, is there?

[TheMAN]

no, just reinstall them in whichever way convenient