aln61

i did look at heads and i noticed small oil leak that just started i will definitly try the water trick. thanks to all and i hope to get this problem fixed shortly

I did the water hose trick and found a intake manifold leak so i finally found a set of gaskets for it and got it back together and still tick so i went back to water hose and sprayed on heads and found the head gasket leaking also guess i should have looked closer the first time . now just have to take off head and go to the mack dealer to match gasket because i cannot find the 11GB #on the engine anywhere all #s i come up with are not the ones to help. should i go ahead and do both heads or not worry with the front head at this time? would it be possible to pull both heads with intake and exhaust manifolds still on it? i do have a over head chain fall to assist.

Thanks for all the help,I did the water hose bit and a intake manifold gasket seems to be the problem Ihave not fixed it yet and hope that is all. thanks again

I had a 237 make a tick when it was leaking a small amount of compression out of the head gasket. I didnt know it was a compression leak untill the gasket went and the noise was gone after i put new head gaskets and fire rings on it

sum old farmer tricks!

IF you suspect the above , it usually happens between the heads !To find or confirm it get a gallon of water or a garden hose and dump or spray it between the heads the noise will disapear momentarly if it does youv'e found your problem!

If the cam is suspected check the drain plug for shiny slabs of metal Note this problem will (USUALLY) be acompanied by a poping noise in the air cleaner!

i did look at heads and i noticed small oil leak that just started i will definitly try the water trick. thanks to all and i hope to get this problem fixed shortly

I've got a 74 mack 237 actually i think the motor is about a 80 s model . it has very loud tick sounds like in the head. it is not a knock just very loud tick. the valves have been adjusted. runs fine, just ticks could it be a burnt exhaust valve. and would it be cheaper to do valve job or find replacement head should i do both heads at same time ?

nice truck , I'd like to have one like it some day hope to see some pics when you get her fixed up !

Great pics, you have better luck with them than i do. I can never get them to show up .

I've been shifting like that didn't know if that was right but seemed to work best . I have gotten some pretty funny looks when running in reverse and keep shifting ing reverse it's cool. This site is great for all the information and help definitly my favorite site on the net..

That video is cool i sat and watched it over and over and naturally my wife JUST DIDN'T GET IT !! I have 74 R685ST with 2 stick but I'm not sure number on tranny My 5 speeds are on the left shifter , Lo then i call high but probably direct . and reverse on the right hand shifter. still loved the video.

Thanks for the video info. I will look it up . Everyone have a Merry Christmas and a Happy New Year!!!

Want to wish you luck on your list it looks alot like mine !! My only hope is the two stick video , where might she find one of them? Those lottery num,bers would be good to. but I'll be about as lucky to get the video . LOL

thats why my pics. aren't up either i've been trying and trying and get know where all errors. i have the fifth wheel for it and only takes about 45- 60 min to change out . i use the dump most .

74 R685 ST With 12 ft. dump or fifth wheel

http://bigmacktrucks.invisionzone.com/inde...r&user=1060

I'm new to the site an so far it looks great. I've been reading the different topics and have already learned alot. I own a 74 mack r685st I have a dump bed on it now and have a fifth wheel with it can change out pretty easy. i don't know which way it came out. i plan on posting some pics. when i figure out how. i'm not much on computer use.