RS Disposal

Sorry for all the questions, but as I mentioned earlier this is my first heavy truck engine. Been cleaning up bolts and misc parts today in prep for new parts later this week. How important is it that I replace all the head bolts?

I do believe it is of some help. any and all part numbers I have has been of help being the only supplier I have been working with that can do anything with the VIN number is the dealer. Everybody else tells me the VIN number is not a good Mack VIN. Dealer has been really helpful in looking up and providing me with Mack part numbers. With that info I have been able to pretty much track down what I need that is no longer available thru the dealer. Pics would be great rs.disposal@gmail.com

I wasn't considering changing out the whole engine . Was just thinking of having spare parts. I don't have anything in my shop big enough to take the cab off and lift an engine out. As stated in previous posts this engine only has about 150,000 miles on it. Unfortunately a collet broke dropping the valve into the cylinder. Being the guy is willing to sell just the head I am assuming that it isn't a running core, therefore as far as spare parts not sure actually what there might be and what I might need.

In my search for a head I keep hearing that it must be the same casting number as my head. What is the difference between the casting numbers? Anybody really know what heads will work? I know there is a 4 valve and a 2 valve head and since mine is 2 valve it is obvious as to what I need there. I may of found a core engine that the guy says matches my engine ID plate. Says he will sell just the head, but if I want the whole engine I can do that also. Limited info on this engine right now until monday as to whether it is a running core or not and I will also ask about casting number. Engine is 90 miles north of me which isn't a big deal if I really want to go look at it. Not sure how I will unload it off the trailer, but guess I cross that bridge when I get there. Also another question about sources additional parts. I think I finally found the intake & water manifold gaskets and what looks like exhaust gaskets through AGKITS (which shows them as being PAI, but when my supplier was talking with them they couldn't find anything other than head gaskets. Questions now is where can I find the metal nut keepers ( not sure what they are called) where you fold over the tab on the exhaust manifold.? The gasket set doesn't show those.

My machine shop is having a hard time getting an injector out, which has to happen before he can send the head for repair. Says he doesn't have alot of time to work on that issue. Going to go pick it up and work on it myself. Any pointers as to what I should try?

I did notice a small crack between the injector hole and valve seat. I am hoping that the shop is able to tell me that the head is repairable.

Yea, I am. Not too many older trucks in the west from what I understand. If my head isn't repairable then finding a good rebuildable in a wrecking yard is my next move and if need be having it shipped

I called and they told me that it was actually out of stock at this time but I could check back being they are continually rebuilding heads

I was able to get the time to pull the pan today. Inside engine is surprising clean, but then it only has about 175,00 mile (but they are city miles). In checking all the cam lobes and lifters I see no abnormal wear. All push rods were rolled on a piece of glass and all are straight. Still hadn't found a head, either rebuilt or a rebuildable one. Piston came out thru the top easily whereas there was absolutely no damage whatsoever to the cylinder wall and no ridge at the top to contend with. So I took the head into my machine shop to get it Magna flexed and hopefully rebuilt. Will wait till I hear back before I pull the trigger in ordering additional parts

Im not sure. Maybe somebody here can answer that. I will also maybe go back to the dealer and see if they are able to answer that question

My machine shop agrees with what I feel was the cause. Keeper broke and caused valve to drop and hit piston. From wear marks and the way the keeper broke it appears the valve stem wore to the point the rocker was hitting the keeper resulting in it breaking. Obviously the piston is destroyed. Machine shop says if head cracked there is a company they deal with that specifically specializes in repairing cracked diesel heads. Not cheap but at this point my only option is to have this head rebuilt. Hoping to find the time this weekend to get the pan pulled

As with everybody else that shows the head on their website, It isn't currently available

Got the head off. Goping to take it to the machine shop and have it check. Needs at least both #4 cylinder valves and at least one seat and valve guide & an injector.. Piston is destroyed.

I haven't had any luck so far in finding a used head as of yet, but honestly haven't spent a lot of time in that direction yet.

I was actually able to tie the injectors tubes back no problem and lift the head straight up and off the dowels. They are in good shape. #4 piston is destoryed but no surprise there. Going to take head in to machine shop to see if they can rebuild. I know right off hand after inital inspection that it will need 2 valves, exhaust valve guide and seat and an injector. I am thinking that this damage wasn't necessarily caused by valve float. Leaning more to the fact the valve spring keeper broke, still probably caused by overspeed on engine, which allowed the exhaust valve to drop and strike the piston and break. Just my thoughts.

Actually they are 20 bolt. 2 bolts I couldn't see when counting were under the rocker arm

I finally got some spare time to start pulling this head off So far I have been able to get all the bolts etc and being 2 piece manifolds only needing to pull the back half. Did pull the entire exhaust though. Only thing I can seem to get loos are the hard fuel lines from the pump to the injectors. Got the injector end no problem but the pump end won't budge and don't want to round off the nuts. It doe look like I can snake the head off being the lines do have a fair amount of movement. I know I have problems with #4, but when I pulled the exhaust manifold I had oil run out of both 4 & 5 ports. Ports 1 - 3 look good, dry and just black soot so it look like I'm dealing with just the rear head. Again, I want to that everyone here for their support and suggestions. Like I have mentioned before, I'm a light truck mechanic and have been twisting wrenches from about the age of 6 with my dad, and this is my first heavy truck engine tearing into. I will post here my progress and what I find. Anybody feel free to send guidance and or tips etc. I'm not too proud and know when to ask for help.

Right now I want to take a minute and thank everyone who has given me insight and point and possible sourcing of parts. Being a one man show, as was my dad, I can be a little stubborn when it comes to asking for help. I will post my progress and what I find. Pretty sure I will have more questions. I am a light truck/automotive mechanic so this is my first heavy truck engine to tear into. So far have had no problems doing my own work on power train, suspension and steering on my trucks.

I was trying to work thru a shop, but nobody seems to really want to work on this older truck because of the availability issue of parts, so they aren't working too hard in sourcing the said parts. I didn't want to get it to a shop and have them tear it down and then tell me that they are unable to do anything. So I am going to pull the head myself. I'm just a one man show and with my backup truck out of commission being hit by a drunk driver, It's been really time consuming servicing my customers. Truck only has about 150,000 mile on it so hoping lifters and cam are ok. Truck was running great before the mishap

Talked with P.A.I and they said they no longer offer thhis particular head, but on the bright side they do still offer pistons if I need one

Now that definitely looks like what I am wanting. I will have to give them a call. Going to try and get the head pulled this weekend to access the damage and to decide where to go from there. I really appreciate the link

So far it looks like the head is no longer available (still looking though). Pistons and the associated rings, valves etc. are. Guess I need to pull the head and actually access the damage. Quick question, is there a trick to getting the exhaust manifold nuts off? Would it be a problem heating up the nuts?

I am keeping my fingers crossed as to what extent of damage there is. Im just trying to source parts for a worse case scenario just in case. Looks like I need to go to the dealer and see if he can give me some part numbers. Nobody seems to be able to pull up anything on the truck from the VIN, which in the past with other parts the dealer has had no problem finding the trk thjru the VIN

pretty sure bent. When I grab onto it with a pair of pliers it doesn't move at all

Pulled second rocker cover. everything there appears to be fine. I can twist the pushrods no problem. How much of a possibilty is it that I am going to actually need a head and a possible piston. Obviously I have one bent valve, but with light truck gasoline engines (I'm a light truck/automotive mechanic) subject to valve float/bent valve I have seen ones that didn't crack the piston