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ENGINE Mounts help

Posted by chormy

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ENGINE Mounts help #1
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 20, 2012 02:10PM Registered: 5 years ago Posts: 879

I'm floating in the pond again, does anyone know if the left and right engine mounts are the same, i have the carb side (left) in my hand but need to know if they are different in size and angle.
Any pic of dizzy side would be nice.

Trying to make a more robust semi solid mount that i don't tear apart, so far two failed mounts on the left side, they have just delaminated. Lucky me I had the stop plates fitted that most people throw away.

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Re: ENGINE Mounts help #2
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: January 20, 2012 02:30PM Registered: 5 years ago Posts: 350

Hi Shaun:

Since you mention "laminated", I'll assume that you are referring to the metal/rubber vulcanized mounts that go between the frame and the brackets bolted to the engine...the vulcanized mounts are the same L.H. & R.H., but the brackets that mount to the engine are "handed" and are marked as such. Don't have a photo right now, but if no one provides one later, I'll follow up.
Correct me if my assumptions regarding your comments are wrong.

Mike Dooley

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Re: ENGINE Mounts help #3
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 20, 2012 02:51PM Registered: 5 years ago Posts: 879

Yes Mike your correct the rubber glue is not upto the job for my application.

Ok so they are different, oh! well will have to make the second when home as I need the measurements and angle. If anyone has one complete right side one on the bench the measurement of width both top and bottom (mm if poss) will give enough to work it out.
Going to use a polly bush and tube to give some vibration damping but restrict fore and aft movement to a couple of mm.

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Re: ENGINE Mounts help #4
C8407 Craig Cummings Williamsburg, Virginia, USA 1969 MG MGC GT	Posted: January 20, 2012 03:27PM Registered: 5 years ago Posts: 256

The metal plate with the 4 holes is 11 X 12 cm
The rubber part is 8 X 11 cm, and is 3 cm thick.
All measurements a close approximations, as I am using a plastic ruler, not the best tool for the job.
Craig

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Re: ENGINE Mounts help #5
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 20, 2012 03:50PM Registered: 5 years ago Posts: 879

Hi Craig

Thanks I have a block with me, in ur photo I need the distance from the top/back of that block to the top/back of the U shaped mount (that goes on the engine. Both for the top and bottom should be around 74mm at narrow end and about 105/6 mm at wide end.

If that makes any sense, so frustrating when ur 4000 miles away from the part you knew you should have put in ur luggage as well.

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Re: ENGINE Mounts help #6
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: January 21, 2012 02:13PM Registered: 5 years ago Posts: 350

Shaun:

Please see attached info...might be of some help.

Mike Dooley

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mount Model (1).pdf (26.5 KB) –

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Re: ENGINE Mounts help #7
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 21, 2012 02:18PM Registered: 5 years ago Posts: 879

Awesome great Thanks Mike. did you auto cad this or have it on file. Hopefully i can get down in teh workshop on the ship and have a go at making a pair up. Something to keep me out of the sun!

Shaun

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Re: ENGINE Mounts help #8
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: January 21, 2012 02:22PM Registered: 5 years ago Posts: 350

Shaun
I drew this up...should have advised that dims will be close...my measuring is only "eyeball accurate".

M

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Re: ENGINE Mounts help #9
Big6Mark Mark Miller Springfield, OR, USA 1960 Austin-Healey 3000 1968 MG MGC "Red Tail" 1968 MG MGC 1968 MG MGC GT "The Wreck" 1969 MG MGC GT "The Lump"	Posted: January 21, 2012 02:43PM Registered: 5 years ago Posts: 1,220

Shaun, as I read this you are having problems with the rubber engine mounts, right? Not the brackets that bolt to the side of the block.

Those rubber mounts are the same left-to-right, they are only indexed as to top or bottom. The base plate dimensions are 4 3/4" wide (120 mm) by 4 9/16" high (115 mm). The bolt pattern there is 4" wide (102 mm) by 3 9/16" (90.5 mm) verticle.

The brackets are handed, but the only real difference is that the right one has a clearance cut in it to accomidate the blanking plate over the mechanical fuel pump hole.

I don't think the "restrictors" really do much good at all. I have been trying to collect a pair for the roadster restoration project, but so far have only gotten two right ones. Really only want them for show. Anyone have a decent left one? Anybody who knows me knows I'm not afraid to straighten mangled metal...

My thought is that you need to either need to make stronger mounts or restrict the engine movement in Yippee. This could mean making solid engine mounts (which I have done before) or making some other restrictors that will limit the stress on the rubber.

Many years ago I saw a ~1974 Pontiac Firebird drag racer with a strong engine (maybe 500 hp?) that had a chain welded to the left inner wing. The other end was bolted to the front of the left cylinder head. Simple engine restrictor and the torque of the engine actually pulled the engine down, compressing the mounts and prevented them from tearing. Perhaps something similar (but more asthetic) is what you need. (P.M. sent.)

C Ya,
Mark

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Re: ENGINE Mounts help #10
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: January 21, 2012 03:20PM Registered: 5 years ago Posts: 350

Shaun:

Just looked at the parts again and discovered an error in my sketch.
I assumed that the holes to mount to the block were in-line, but discovered that there is a 2.5mm offset on one side, top to bottom.
Will modify sketch and repost.

@Mark: The heights of the support surfaces are substantially different from left to right.

Perhaps a better solution might be a perimeter stop...like a box w/ a mounting flange and matching hole pattern with a cap that would restrain the entire top of the rubber mount with a clearance slot for the engine bracket. Don't know if this is possible with the hole locations though.

MikeDooley

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Re: ENGINE Mounts help #11
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 21, 2012 03:45PM Registered: 5 years ago Posts: 879

Hi Mike

I did not notice I have that side sitting on my desk so no worries. Hole centres are 55mm for that side on my block.

Mark
yes the rubber is being torn from the plate, the original restrictors seem to work so far.

What I am doing is to mount a bush in a welded tube to one side and on the other side use two plates welded to base to shroud it and use a 15mm bolt as a pivot point. this will allow only a small compression of the bush lips in fore and aft movment.
a rough drg !!

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Re: ENGINE Mounts help #12
ga duke Mike Dooley Newnan, GA, USA 1969 MG MGC GT 2011 Nissan 370Z	Posted: January 21, 2012 03:52PM Registered: 5 years ago Posts: 350

Shaun:

Only for your information:

http://www.ebay.co.uk/itm/MGC-ENGINE-MOUNTING-BRACKETS-1-PAIR-/380383167552?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item58909a8440

MikeDooley

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Re: ENGINE Mounts help #13
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 21, 2012 04:05PM Registered: 5 years ago Posts: 879

Thanks Mike

Have a few spares in my parts box at every track day lol!

better be off to my pit, Nite all

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Re: ENGINE Mounts help #14
Big6Mark Mark Miller Springfield, OR, USA 1960 Austin-Healey 3000 1968 MG MGC "Red Tail" 1968 MG MGC 1968 MG MGC GT "The Wreck" 1969 MG MGC GT "The Lump"	Posted: January 21, 2012 06:04PM Registered: 5 years ago Posts: 1,220

Shaun:

That looks like a good design. Restricted movement from torque, maybe not so much in the for-and-aft direction, but could be just what you need.

Might try something like that for myself!

C Ya,
Mark

Edited 1 time(s). Last edit at 01/21/2012 06:05PM by Big6Mark.

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Re: ENGINE Mounts help #15
Big6Mark Mark Miller Springfield, OR, USA 1960 Austin-Healey 3000 1968 MG MGC "Red Tail" 1968 MG MGC 1968 MG MGC GT "The Wreck" 1969 MG MGC GT "The Lump"	Posted: January 23, 2012 09:09PM Registered: 5 years ago Posts: 1,220

Yes, on further inspection I realize I missed the obvious.

The bolt holes in the mount brackets are offset because of the angle of the crankshaft axis in the chassis. Looks like the angle at the mounts is about 2 degrees.

Don't know what the actual angle of the crank is to the horizontal, but that is the angle of the bolt pattern in the brackets.

C Ya,
Mark

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Re: ENGINE Mounts help #16
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 24, 2012 12:10AM Registered: 5 years ago Posts: 879

Mount is now in the workshop, I went down to start to cut plate and a fitter had started to do the job for me , so this prototype will cost about $2500 lol! lets hope the chief Engineer doesn't find out. Still I am the client ! not as much as the SS BBQ's or boat trailers tho.

Thanks Mark the drg was a great help, I think the engine angle is 2-3 '

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Re: ENGINE Mounts help #17
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 28, 2012 02:52PM Registered: 5 years ago Posts: 879

Well mounts under construction , unfortunaly 6mm plate is all I had in the shop so they will be strong if a little OTT.
I may have to alter the bush material buts its a start. will try one mount first before making the other.
Time wise and material they will work out expensive as one off's if it works I may have some plates laser/water cut in 4mm will save time.

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Re: ENGINE Mounts help #18
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 28, 2012 03:44PM Registered: 5 years ago Posts: 879

Another

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: ENGINE Mounts #19
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: February 07, 2012 03:47PM Registered: 5 years ago Posts: 879

Needs cleaning and painting now then just have to get home for a test.

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