Popular Post fxfymn Posted September 12, 2021 Popular Post Share Posted September 12, 2021 The last couple of times I started the old girl I noticed white smoke which seemed to disappear after it warmed up which I attributed it to a bad valve seal. Then I had it out last week and it did not stop smoking and when I was putting it away and I noticed that it was running much hotter than usual. I checked the radiator after it cooled down and it was low, but the oil was clean and at the correct level so my first guess was a bad head gasket. After I tore it down it was pretty apparent that something was going on with the rear head as it was pitted and one spark plug was rusted in place. We also detected traces of stop-leak around the gasket. Upon very close inspection we could see what appeared to be a crack in the #6 cylinder around the casting near the valve. So, long story short I am now in the process of replacing the head with one from a spare engine I had bought a few years ago from Dave Klein. (Thanks Dave!) My engine is an ENF510A and the spare is a ENF510, but the heads are the same. Olson's is able to supply the needed gasket set so all in all it wasn't as bad as it could have been. My bet is this has been there for quite some time and the use of stop-leak worked to keep it running. It would not surprise me it goes all the way back to when it was in-service in Richmond in the 70's. 3 Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/68094-cracked-head-on-the-52-type-75a/ Share on other sites More sharing options...
Vladislav Posted September 12, 2021 Share Posted September 12, 2021 It doesn't sound as a nice story to wish anyone to pass through. But brings hopes for smooth turn out. And no one would argue at the moment that purchasing of the spare engine was a wise decition. Carl, are both ENF510 and 510A have double spark plug heads? Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/68094-cracked-head-on-the-52-type-75a/#findComment-479812 Share on other sites More sharing options...
fxfymn Posted September 16, 2021 Author Share Posted September 16, 2021 Vlad; I believe any of the gas engines that are designated with the "F" at the end of the engine model number have the dual ignition heads. Mack used the EN510 and EN510A in OTR trucks as well which do not have the dual spark plug heads. The main reason I bought the engine when I had the chance was because it was a fire service engine and the heads are damn near impossible to find. Who knew I was clairvoyant? Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/68094-cracked-head-on-the-52-type-75a/#findComment-480020 Share on other sites More sharing options...
Vladislav Posted September 16, 2021 Share Posted September 16, 2021 Thanks for educating me on the Mack engine F-mod. Will keep in mind. As of clairvoyants it seems easy to recognize such a person by a big shed in his back yard full of old spares 1 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/68094-cracked-head-on-the-52-type-75a/#findComment-480030 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.