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Thread: Correct size U bolts for Series 3 Land Rovers?

  1. #1
    Join Date
    Jul 2012
    Location
    Brisbane
    Posts
    1,626

    Correct size U bolts for Series 3 Land Rovers?

    Hello from Sherwood.

    A quick question about identifying the correct U bolts for a Series 3 88” model.

    My truck is nominally a 1975 build S3 by its chassis number. However, some if not most of the running gear most likely came from other vehicles.

    I am thinking of replacing the U bolts as part of a suspension upgrade but am having a bit of difficulty deciding what the correct size is for the truck. My limited understanding is that U bolts come as either 7/16” or metric (~9/16”) and according to the Series 3 parts catalogue these may be differentiated by whether the axle is C or D suffix. However, other sources suggest that all S3 trucks have the larger metric bolts.

    Which is correct and how do you identify a C or D suffix axle?

    Incidentally, my callipers suggest the diameter of the existing bolts is larger than 7/16”.

    Cheers,

    Neil

  2. #2
    Join Date
    Jul 2012
    Location
    Brisbane
    Posts
    1,626

    Metric?

    Hello again and answering my own question.

    The front axle serial number on my truck, located on the axle tube below the left hand breather, is 91170244E.

    From a little further searching of obscure web sites I gather that the first three digits (911) identifies the axle casing as having been fitted originally to a 109” 4 cylinder RHD truck - confirming my long held suspicion that these were not the original axles and diffs, Ratel being an 88” truck. The suffix (E) apparently identifies the vehicle as possibly containing some metric parts.

    Axles3 by Neil MacLeod, on Flickr

    I can’t locate a serial number on the rear axle, but the tube diameter is the same as the front axle.

    So, drawing this together I am concluding that the U bolts on my truck are indeed metric as apparently fitted to some, if not all, S3 Land Rovers. Makes a nice change from Miss Scarlet with the lead pipe in the observatory.....

    Cheers,

    Neil

  3. #3
    Join Date
    May 2013
    Location
    Bittern Vic
    Posts
    244
    I found Paddock spares has a good range of u bolts and fairly good explanation of where each type goes in each model.

    It seems there are round tops and squarer tops. and these change depending on front/rear and diff type.

    Have a look at Paddocks site it may make it a bit clearer for you.

    Ian

  4. #4
    Join Date
    Jul 2012
    Location
    Brisbane
    Posts
    1,626

    Thanks

    Hello again from Brisbane.

    Yes, there are various U bolts. Typically, the front axle has 3 that are the same and 1 that has a more square profile because it is closer to the diff casing. The rear axle has 4 U bolts that are the same.

    The main issue has been the bolt diameter. None of the local suppliers are particularly helpful in differentiating which fits which - had some very long conversations with a couple of suppliers in Queensland and Victoria on the topic.

    Anyway, I have solved it now and will move on to a few other tasks.

    Cheers,

    Neil
    Hon Secretary - SLOw Inc

    1975 S3 88" - Ratel

  5. #5
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    21,402
    Series 1 and early Series 2 had 7/16" with BSF threads. Series 2a and early Series 3 were 1/2" with UNF threads. The change times are very approximate, and probably fairly moot, since probably three quarters of Series Landrovers on the road today do not have the original U-bolts. Except for the length and that as noted, the inner RH front is flat topped, they are all pretty much interchangeable.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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