Lotus Elan

Slight knocking after oil change

PostPost by: andyhay » Sat Jun 03, 2017 12:35 pm

Hi all.

I just did the first oil change of my Elan plus 2 in my ownership. I used a ryco z9 filter as recommended by a club member. The car started and ran perfectly but after a 15 minute run I went to park it for the night and noticed a knocking sound from the engine at idle. Not loud but noticeable. Particularly noticeable as the car was turned off. Could this be related to the oil filter? It fitted fine but was a large diameter than the one that came off. Dip stick is reading full.

I'll try fitting a new oil filter as a first step.

Thanks for any assistance.
andyhay
First Gear
First Gear
 
Posts: 47
Joined: 03 Feb 2016
Location: Australia

PostPost by: Davidb » Sat Jun 03, 2017 3:32 pm

What weight oil did you put in?
'65 S2 4844
Davidb
Fourth Gear
Fourth Gear
 
Posts: 871
Joined: 02 Jul 2009
Location: Vancouver, Canada

PostPost by: andyhay » Sat Jun 03, 2017 9:28 pm

20/50
andyhay
First Gear
First Gear
 
Posts: 47
Joined: 03 Feb 2016
Location: Australia

PostPost by: rgh0 » Sat Jun 03, 2017 10:49 pm

The correct filter is a Ryco Z62. Is the larger diameter Z9 hitting on something when the engine moves?

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7512
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: andyhay » Sat Jun 03, 2017 11:16 pm

That is probably the issue! There is only about 1 mm between the filter and the sump. Thanks Rohan.
andyhay
First Gear
First Gear
 
Posts: 47
Joined: 03 Feb 2016
Location: Australia

PostPost by: andyhay » Sun Jun 04, 2017 1:06 am

I won't have a chance to change the filter until next weekend but I started the car this morning and noted the following:

No knocking sound when cold. My engine vibrates less at idle when cold for some reason

Knocking started when the engine was warm. But only at idle. As soon as I applied any throttle and the engine smoothed out there was no sign of the knocking.

Car is driving perfectly. Oil pressure good.

I think the above supports Rohan's theory.

I did notice a strange vibration rattle noise at idle from well under the car prior to changing the oil while it was warming up. This was intermittent and didn't happen while driving. This happened again when I started the car this morning. Sounded like something might be loose.

Thanks.

Andy
andyhay
First Gear
First Gear
 
Posts: 47
Joined: 03 Feb 2016
Location: Australia

PostPost by: Bud English » Sun Jun 04, 2017 4:59 am

...except it won't be knocking against the sump. That 1mm distance is fixed as the oil pump with filter and sump are both bolted to the block. Might be hitting the frame or something else though. :wink:
Bud
1970 +2S Fed
"Every Lotus that an owner modifies makes yours worth that much more." - You're welcome!
User avatar
Bud English
Fourth Gear
Fourth Gear
 
Posts: 934
Joined: 05 Nov 2011
Location: Winnemucca, NV, USA

PostPost by: billwill » Sun Jun 04, 2017 12:48 pm

Knocking is often due to part of the exhaust system tapping on the gearbox.

But it could merely be that you put in thinner oil so the big-ends are making more noise than before.

While you are right to suspect the last item you changed, it is extremely unlikely that an oil filter can cause any knocking noise.
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4721
Joined: 19 Apr 2008
Location: London UK

PostPost by: nmauduit » Sun Jun 04, 2017 1:10 pm

andyhay wrote:No knocking sound when cold. My engine vibrates less at idle when cold for some reason

Andy


for investigating that kind of vibration I would first check/clean or swap the spark plugs...
S4SE 36/8198
User avatar
nmauduit
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1484
Joined: 02 Sep 2013
Location: France

PostPost by: 2cams70 » Sun Jun 04, 2017 1:53 pm

The Ryco Z9 is for an Australian 6 cylinder Ford Falcon. In the Falcon it sits horizontally therefore it is fitted with an internal anti drain back valve. On the Lotus (Ford Kent) engine the filter sits at an angle of about 60 degrees so there is no need for an anti drain back valve. Maybe the anti drain back valve is having an undesirable effect??
The correct filter is a Ryco Z62 (or direct equivalent) Why use something else? Bigger is not necessarily better.
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2015 Honda City 5spd.
2cams70
Fourth Gear
Fourth Gear
 
Posts: 938
Joined: 10 Jun 2015
Location: Australia

Total Online:

Users browsing this forum: Peter +2, Pfreen and 10 guests