rear iso help needed

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hi everyone. first timer here. im in the process of takin apart the rear iso on a 69/70 frame. it already has mk111 ones in it. i bought another mk111 kit replace it. ok, ive finally managed to remove the rear engine mounting stud and just have the rubbers to remove today. now my problem is that the mounting stud measures 0.5 inch (12.66mm) across. and the inside of the new iso tube with the rubbers on is 0.54inch (13.66mm) is this amount of slop right as it seems way exessive. the frame holes for the bolt are a good fit. all i can think of is the latter chassis has a larger bolt maybe. or someones made my new one too large internally. hope someone can shed some light on this for me. thanks, john.
 

rvich

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1/2-inch should be right for the rod. I dunno about the clearance. Don't have anything here handy to measure the inside diameter on.

Russ
 
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I believe it's the end cap that centers the bolt and the tube. The bolt is there to tighten up the frame against the Iso unit.
 
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Hi. I was wondering if you are replacing the rear iso rubbers with the engine in the frame and the bike pretty much complete? I have a 1968 and had plans to do the rear isos. I found some good info about doing it in place but I am pretty sure the directions are for a later frame that does not have the cross bar under the engine. Seems to me that the engine will not move forward and down enough to do the early frames in the same manner. But I would be pleased to hear different.

Stephen Hill
1968 Fastbak
1968 Mercury
1971 Roadster
1974 Interstate
 
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cheers diablough, i think that could have sorted it out in my head. i stripped the bike completely 2 days ago so changing them isnt a problem. bit of a polishing around to do next few days then put it back together. cheers for the help. will post a pic or two when done. john
 
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You will probably find that the adjuster end is OK but there is extra clearance on the fixed end. Mine are Norvil and needed an 005" shim wrapped inside the LH end tube to tighten up though in the real world it may not make a huge difference. I did the front after reading someone else's experience but haven't stripped the rear yet. Of course what I've done now twists the assy one way since the rear is still with the large clearance on the RH but is it really a problem? I don't think so. My front ISO offset was originally out by 060" compared to the rear at 0.31" v 0.25" so a few thou is neither here nor there.
 
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