Engine mount inspection - vibration on idle

Read the Frequently Asked Questions that have been accumulated over time.
Post Reply
User avatar
HypoThermia
Forum Moderator
Forum Moderator
Posts: 7388
Joined: Mon Apr 04, 2005 9:38 pm
RX-8: R3
Colour: Aurora Blue Mica
Location: London
Has thanked: 4 times
Been thanked: 15 times

Engine mount inspection - vibration on idle

Post by HypoThermia » Sun Feb 17, 2008 2:03 pm

You can discuss this FAQ entry in the original post in the hints and tips section.

The rubber engine mounts help reduce the amount of vibration that is transmitted from a running engine to the chassis of the car. The rubber mounts are fixed onto the chassis, and a bracket is fixed to the engine. If the rubber mount fails then the engine bracket will settle onto a hard stop (by design, it won't fall out!) and you'll get a higher level of vibration/shudder that is most noticeable during idle.

The engineering diagram below shows where the mounts (1,2 and 4,5) are relative to the engine.

Access is a little awkward without a car jack and some safety stands, but it is possible to take pictures with a small digital camera. Access can be gained from underneath the car just behind the front wheels (picture below, red arrow), by placing the camera inside the body space (about 10-12cm up) and looking towards the front of the car. With some trial and error you should be able to see the engine mounts, as shown in the following posts.

Take care with the farside access as this goes right by the cat (and will be hot if you've just driven it! :wink:)

Good and bad pictures follow in the next two posts. 8)
Attachments
IMGP1567.JPG
Viewing access for the engine mounts (nearside). Push the camera fairly high into the body space and point towards the front of the car.
IMGP1567.JPG (99.22 KiB) Viewed 6100 times
BHE0110T018.jpg
Engineering diagram showing the engine mount points (view is from the front nearside wheel arch, looking down on the engine)
BHE0110T018.jpg (36.61 KiB) Viewed 6101 times
Last edited by HypoThermia on Sun Feb 17, 2008 2:12 pm, edited 2 times in total.
(Former Chairman, Membership Secretary, and long time Admin)
R3 Aurora Blue Mica - Racing Brake calipers, rotors and steel brake lines - Racing Beat exhaust - TARGA2 sensors - Lockwood grilles - blue LEDs - side and fog light upgrades - window tints - Eibach spacers
And still three gears left...

User avatar
HypoThermia
Forum Moderator
Forum Moderator
Posts: 7388
Joined: Mon Apr 04, 2005 9:38 pm
RX-8: R3
Colour: Aurora Blue Mica
Location: London
Has thanked: 4 times
Been thanked: 15 times

Post by HypoThermia » Sun Feb 17, 2008 2:07 pm

This picture shows the nearside mount that is still working correctly. Note that the engine mount is evenly spaced within the bracket (three red lines).
Attachments
IMGP1564.JPG
Nearside engine mount - note the even spacing. This is in good condition.
IMGP1564.JPG (94.62 KiB) Viewed 6099 times
Last edited by HypoThermia on Sun Feb 17, 2008 2:17 pm, edited 1 time in total.
(Former Chairman, Membership Secretary, and long time Admin)
R3 Aurora Blue Mica - Racing Brake calipers, rotors and steel brake lines - Racing Beat exhaust - TARGA2 sensors - Lockwood grilles - blue LEDs - side and fog light upgrades - window tints - Eibach spacers
And still three gears left...

User avatar
HypoThermia
Forum Moderator
Forum Moderator
Posts: 7388
Joined: Mon Apr 04, 2005 9:38 pm
RX-8: R3
Colour: Aurora Blue Mica
Location: London
Has thanked: 4 times
Been thanked: 15 times

Post by HypoThermia » Sun Feb 17, 2008 2:10 pm

This is my farside mount and it has failed. The bracket on the engine mount has a very narrow gap at the top, and is no longer evenly spaced (red lines). Although harder to see, the rubber mount has collapsed.

This will need to be replaced and (with some good luck) will receive a good will contribution from Mazda.

Ian.
Attachments
IMGP1580.JPG
Failed engine mount, note the uneven spacing and collapsed rubber mount.
IMGP1580.JPG (93.12 KiB) Viewed 6096 times
(Former Chairman, Membership Secretary, and long time Admin)
R3 Aurora Blue Mica - Racing Brake calipers, rotors and steel brake lines - Racing Beat exhaust - TARGA2 sensors - Lockwood grilles - blue LEDs - side and fog light upgrades - window tints - Eibach spacers
And still three gears left...

User avatar
wotnopiston
Former Member
Former Member
Posts: 36
Joined: Fri Oct 06, 2006 6:02 am
RX-8: 231
Colour: Brilliant Black
Location: Suffolk
Has thanked: 0
Been thanked: 0

Re: Engine mount inspection

Post by wotnopiston » Sat Aug 22, 2009 11:38 pm

Just had the bad news when having a service done, both mounts had it, drivers side the worst, Mazda quote £386 to supply and fit, typical rip of price, this should be a recall replacement by the number of complaints, the stores dept even admit that they now keep a stock of these because of the problem :evil: Even so i wanted them quick, so could not wait for the cheap option from the states, So i had to bite the bullet, And decided to fit myself, And saved over £100, Still paid £280 for them :thumbdown: ,
fitting was surprisingly quick and easy, you just need a trolly jack, axel stand, 14m socket/spanner, and wd40, drivers side although the worst, not fully collapsed,
Attachments
mount a.JPG
mount a.JPG (37.64 KiB) Viewed 5278 times
new mount.jpg
new mount.jpg (67.94 KiB) Viewed 5278 times
old mount.jpg
old mount.jpg (66.21 KiB) Viewed 5278 times
Last edited by wotnopiston on Sun Aug 23, 2009 5:09 pm, edited 1 time in total.
230 Brill Black Stainless strakes, lowered plate, Magnaflow exhaust,grills, PZ spoiler

Post Reply

Return to “FAQ - Frequently Answered Questions”