Tm 150 head rebuild

[Farmer mk1]

Hello everyone.
We have had the head rebuilt with new parts through out and put it all back together, also had new alternator as it was getting a bugger to start in winter. We also had the injectors tested and one wasn’t right so had that repaired and all fine now. The head was only done as a precaution and cheaper than if it drops a valve to repair.
We got it back together Sunday and it fired up easy enough and runs smooth and had enough power, but it smokes slightly with a tinge of blue to it now. There wasn’t any play in the pistons etc and we cleaned the top of the pistons round the edges and tops of the sleeves of the carbon build up while we was there. I thought it might be same as before where it didn’t smoke at all unless under real heavy load and getting low on revs but now even when not pulling it has a slight blue smoke to it.
The lad who helped me rebuild it says it might stop once it has run in again after a few week but I’m not convinced. Anyone else had this before after a head rebuild?
Thanks
Mark

 

[Mur Huwcun]

Not after a head rebuilt but you get it if you replace the rings in slightly worn bores. They do settle in with some work though. I’d be inclined to give it a few days work before worrying too much. Is there any oil in the manifold/exhaust. Seen a 155 that had oil dripping out of the joint between turbo and exhaust box after some engine work. It cleared up with some work.

 

[Farmer mk1]

I didn’t notice any oil in the exhaust to be honest as it was a new turbo about 2 1/2 year ago. It never smoked before we did the head, I just wonder if we have softened the carbon up with the wd40 we used to clean the head down and it has soaked into the carbon left over and is burning that. It wants a good run on the dyno I think to see what it’s doing. It does run a lot smoother so I think it is right but I can’t seem to understand why it puts out a slight blue haze.

 

[Timbo]

Give it a week of varied moderate work and then decide.

 

[Farmer mk1]

We haven’t done anything to the bores, other than scrape top of pistons off round the edge of like half a mill of carbon and top of the bores the same thickness. I think it might just need to carbon up abit and it will be fine again.

 

[ridger]

Needs slurry pump or plough for one day. My 140 smoked for the first half hour on the plough and is perfect now

 

[Farmer mk1]

@ridger is that after you did the head on yours?

 

[db9go]

We haven’t done anything to the bores, other than scrape top of pistons off round the edge of like half a mill of carbon and top of the bores the same thickness. I think it might just need to carbon up abit and it will be fine again.

I was always told never clean the top of the pistons as you break the carbon seal

 

[daveydiesel1]

I was always told never clean the top of the pistons as you break the carbon seal

Sure thatl build up in couple hundred hours?

 

[db9go]

Sure thatl build up in couple hundred hours?

Yes it will but that could be the problem with smoke

 

[Tomtrac]

Yes it will but that could be the problem with smoke

Worst case carbon fallen down between piston and liner and scord bore
But if you cleaned it did you hoover bits out from around piston
As above could off left it there it only build up again but if it was a mm it would give it more compression and poss make harder to start
One off them million and one questions do i or not
Am shure it will bed in after some good hardwork
Let us know how it does
I run a 8160 with turbo on 8,000 hrs pluss not touched but it doesnt work much in last five years

 

[Farmer mk1]

We just wiped it out best we could. There wasn’t any big lumps of carbon, just broke up into more small like powder pieces so don’t think it will of scored owt. Did it with one of them like Stanley blade scrapers. I think it just needs some good work to build up abit of a seal. I can’t see abit of carbon scoring the bores, or that Stanley blade scraper.

 

[Badshot]

If it gets difficult to start fit an iskra starter. You'll have no more trouble starting.

Think they might be mahl or similar now.

 

[Farmer mk1]

It starts fine now the alternator is charging it better. It’s done about 2/3 hours of work since rebuild.

 

[ridger]

@ridger is that after you did the head on yours?

Yes, head and injectors. 300 hours later it's as good as any iv ever seen.

 

[Farmer mk1]

Yes, head and injectors. 300 hours later it's as good as any iv ever seen.

Ah that’s good news. I took ours in to the dyno today, it had head and injectors done and it did 145hp at shaft so I turned it up to 160hp at shaft. It didn’t do any more smoke on the dyno with the extra 15hp than it did at 145hp.

 

[ridger]

Ah that’s good news. I took ours in to the dyno today, it had head and injectors done and it did 145hp at shaft so I turned it up to 160hp at shaft. It didn’t do any more smoke on the dyno with the extra 15hp than it did at 145hp.

I'd just leave it around 150, my four are all standard and iv never had to touch a gearbox or anything. A few around here that that gave gearbox trouble were away over 180 hp, one even blew the side out of engine but it was screwed away up and the timing altered some how to let it be screwed even more

 

[Farmer mk1]

This will be 160hp at the shaft and near 175 180hp at the engine. It should be ok I think.

 

[Tomtrac]

This will be 160hp at the shaft and near 175 180hp at the engine. It should be ok I think.

My 8160 is 160 on shaft
I would off thought loss off nr 35-40 horse loss from engine as old straight geard tractors lost 15-20 odd horses with more hydrolics and multi clutch gears more loss