mack mhe9 Posted March 8, 2013 Share Posted March 8, 2013 was board so what else to do, the head gaskets aways leaked oil so time to fix it, i put a water bottle for up there for those of you who dont get in side one of these that often to get an idea what an 998ci, or 16.4lt 8cyl engine looks like in side. 1 Quote Link to comment Share on other sites More sharing options...
smorse54 Posted March 8, 2013 Share Posted March 8, 2013 Yea Ray,been there a couple of times myself.A big bear of an adventure.Did you find head bolts?I remember you broke one in Iowa a while back.By the time it's all together you won't be bored. Steve Quote Link to comment Share on other sites More sharing options...
rsb502 Posted March 8, 2013 Share Posted March 8, 2013 If your bored come on down here I got plenty to do, when you go back together are you gonna use the ARP bolts or new Mack bolts? I checked with DF, $1600 for a set of ARP's expensive but probably worth it making 30+ psi manifold pressure, I think I can order em thru Summit cheaper I just don't know the sizes. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
mack mhe9 Posted March 8, 2013 Author Share Posted March 8, 2013 thanks on the arp info i was thinking that, just was not sure Quote Link to comment Share on other sites More sharing options...
MACKTRUCKS4 Posted March 10, 2013 Share Posted March 10, 2013 Just put mine back together today. Was not getting the boost that I should have (only 38 where as the turbo I put on should get 50) So I pressurized the intake from the turbo (including the turbo) to the heads. Backed off on the rocker shafts so all the valves were closed (time to reset the valves anyway) and found number one cylinder was leaking air somewhere. So decided to pull the head to find out what was going on and found one of the intake seats was loose causing the valve to move around (bad) but good that I caught it. Just happened to have a spare head at the machine shop getting redone and it was ready the next day. Funny thing is the head that went bad was the only head on the truck that was the old style valves (bigger stems) Now all the heads are the same size valve stems. Dodged a bullet. Quote Live every day like it's your last, because one of these days, it will be. Link to comment Share on other sites More sharing options...
mack mhe9 Posted March 10, 2013 Author Share Posted March 10, 2013 nice save, i just had some oil and just started a coolant leak so while it was parked why not. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted March 10, 2013 Share Posted March 10, 2013 Are you guys having the valve seats pressed over spec or just stock? That's actually the biggest reason I wanted to send a set to Francis since that's the cause of most E9 failures. Im gonna go with the ARP bolts if I pull my heads too I talked to a couple guys that used to break bolts all the time, they went wit the ARP bolts and haven't had a bolt or gasket issue since. Only problem with that stuff is Dale Francis is the only place I can find that does it and they are the highest machine shop I've found too. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
MACKTRUCKS4 Posted March 10, 2013 Share Posted March 10, 2013 Just stock on the seats. I asked my guy about pressing them in over spec., and he didn't know anything about it. His concern was the heads were know for cracking and he though that it would put more stress on the heads. But I'm sure it works, Dale does it so I'm sure it's been tested. Dale is the one that built my turbo. Have not had any problems with heads bolts but I don't run a lot of miles. Quote Live every day like it's your last, because one of these days, it will be. Link to comment Share on other sites More sharing options...
Tom Menges Posted November 17, 2023 Share Posted November 17, 2023 I have a V-9 Mack engine and i keep blowing head gaskets out between the heads. I had the heads reconditioned and also put new head bolts in. Had about 6000 miles until this problem started. Checked liners, liner height were all the same measurement before i put it together. The ends of the heads, the gaskets are fine. Has anyone ever had this issue? Any advice is appreciated. Quote Link to comment Share on other sites More sharing options...
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