DieselLife Posted March 30, 2014 Share Posted March 30, 2014 Hi, im fairly new to this but i have a 1982 U686ST that im slowly starting to restore. I was just wondering what the engine size is? It is intercooled and has the original engine in it. Any information on this truck would be apprieciated. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/ Share on other sites More sharing options...
1958 F.W.D. Posted March 30, 2014 Share Posted March 30, 2014 Send an email with your serial number to Don Schumaker or give him a call, have the SN handy to give to him or whoever answers the phone, and request copies of your factory archives. There is a 6-8 week wait due to numerous requests and limited (volunteer) staffing. You will receive a very large and heavy box in the mail FOR FREE. When you do receive it, make sure you send them a donation check, and don't be cheap- you'll understand when you see what they send you. Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239873 Share on other sites More sharing options...
jakebrake86 Posted March 30, 2014 Share Posted March 30, 2014 I would say most likely a 300, being a 686. A 685 would be a 237. 1 Quote Jake Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239881 Share on other sites More sharing options...
2stacksuperdog Posted March 30, 2014 Share Posted March 30, 2014 As said a 686 is 300. Dont forget some pictures.... 1 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239895 Share on other sites More sharing options...
umodelnut Posted March 30, 2014 Share Posted March 30, 2014 Yeah, 686, 300. Im a huge U model fan, Im restoring a 75' U685ST right now. Would like to see some pictures of your truck. Nice too see someone else restoring a U. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239904 Share on other sites More sharing options...
DieselLife Posted March 30, 2014 Author Share Posted March 30, 2014 What are some of the differences between a 237 and 300? i appericiate all this information. I will try to get some pictures up Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239960 Share on other sites More sharing options...
umodelnut Posted March 30, 2014 Share Posted March 30, 2014 What are some of the differences between a 237 and 300? i appericiate all this information. I will try to get some pictures upMore horsepower and the intercooler. Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-239983 Share on other sites More sharing options...
DieselLife Posted April 1, 2014 Author Share Posted April 1, 2014 I did brakes on the old girl today and had trouble finding the correct front brake hardware kit. It is the stock backing plate and the parts guy told me that I would have to change the backing plate because they don't make this style anymore. Is this really true? I ended up finding the kit just thought it was weird that they wouldn't have these anymore. Anybody else have this problem? Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-240196 Share on other sites More sharing options...
Superdog Posted April 1, 2014 Share Posted April 1, 2014 Welcome to the New World Order as ruled by Volvo. Nothing pisses Volvo off more than having to supply simple maintenance parts for our old Macks that keep on going and going year after year while their newer products fall to pieces in months. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-240203 Share on other sites More sharing options...
1958 F.W.D. Posted April 3, 2014 Share Posted April 3, 2014 I did brakes on the old girl today and had trouble finding the correct front brake hardware kit. It is the stock backing plate and the parts guy told me that I would have to change the backing plate because they don't make this style anymore. Is this really true? I ended up finding the kit just thought it was weird that they wouldn't have these anymore. Anybody else have this problem?If you are going to restore an old Mack, you have come to the right place. Learn these two valuable resources:1. The list of vendors (that have NOS and old, serviceable Mack parts and components) that the Mack Museum has (I believe it to be on their website.)2. Get Watts Mack's phone number (Or find Barry on here) and program their number into your phone and/or his email address. Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/35236-u686st-info/#findComment-240478 Share on other sites More sharing options...
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