Newly rebuilt TD42...break in kms??

[Aben Dean]

I have just finished rebuilding my TD42 motor. new pistons/liners / rings/ bearings/ seals/ new turbo injector pump, fully serviced injectors, serviced cylinder head. its fitted with a Safari turbo kit (t3/t4 turbo). currently no boost increase. some say i will have to drive slow for abt 1000kms then i need to service the engine again then i can use it under heavy load. is that correct?? how many kms i need to drive slow before i can use it with heavy right foot!

[Bob]

I would drive normally up to 110/115Kph but not under heavy acceleration and vary your speed up and down.

[Aben Dean]

for how long / how many kms before i can drive it hard.......one of my old pistons slightly melted maybe because of over fueling / boost. so want to be really cautious this time around.

[healy]

Yeah I'd do it for 1000-1500ks just the same as when ya rebuild diffs Etc

[threedogs]

Always vary speed and revs for 1000k , this gives the bore a full work out, never hold high revs in any gear
Rev out through the gears after 500k now and again, but mainly run it in the way you're going to drive it
Change oil after 200k, and again at 1000k, removes any metal floating around,

[patch697]

I have just finished rebuilding my TD42 motor. new pistons/liners / rings/ bearings/ seals/ new turbo injector pump, fully serviced injectors, serviced cylinder head. its fitted with a Safari turbo kit (t3/t4 turbo). currently no boost increase. some say i will have to drive slow for abt 1000kms then i need to service the engine again then i can use it under heavy load. is that correct?? how many kms i need to drive slow before i can use it with heavy right foot!

This is & I guess always will be a well debated subject.

I 100% agree with the 1000km service as a newly built engine will punish the engine old to death in the first 1000ks as its bedding itself in.

The rest, well?????........... Some say to take it easy for the first 1000ks to let the engine bed in & to very your speeds to very the combustion temperatures, this is said to aid in the piston rigs bedding process. Its also the preferred method I choose to use for most application.

Others will tell you to load it up & work it hard to aid the bedding in process. Its also been said that this method will produce a better stronger engine at the end of the run in period & extend engine life. Facts I believe that are yet to proven????...

So my point being it depends really on who you talk to as to what sort of answer your going to get on the subject matter but here is my advice for what its worth.

Get in contact with your engine builder or engine parts supplier, what ever your case may be & ask them what they recommend for the running in of they're engine parts.

I personally think that you will find the best most appropriate answer to your question there.

[Aben Dean]

The guys who rebuild it say they normally keep the motor start for one whole day (not running the vehicle, just keeping the engine start) to see the temps and oil levels etc. but a Diesel services workshop guy said they recommend 1000ks easy driving....then service it at 1000k then i can use it like i want. But it would be good to take other peoples views in this forums before i decide what to do? someone else must have done a rebuild here can share there experience

[nissannewby]

Its best to put some load on the motor but this is within reason. I would just drive how you do any other day of the week and change the oil and filters 100-200km and then again at 1000km then back to normal service intervals.DO NOT allow a freshly rebuilt engine to just sit and idle or be at a no load condition at all this will cause your bores to glaze over and give poor piston ring bed in.

Just driving it as you would any other day will put sufficient load on it for bed in.

[johno90]

Ive always been teached to hit it hard, and in college we actually did the theory and it was proven load= better bedding for the rings but within reason. good example is when you build a tuff v8 the first things you do are bed the cam in then go do a massive skid and then go find some tall hills.

[Aben Dean]

damn......drive it hard or drive it soft?? mixed answers....tuff choice to make!

[Aben Dean]

Got this reply from Alan of Terrain tamer :
Running procedure would involve:
1. No prolonged idling.
2. No constant speed for prolonged periods (vary speed between 60-100km/h).
3. Reasonably hard acceleration regularly (from traffic lights).
for 1,000km then change oil and filter - but no future boost increase!
You need an intercooler and exhaust temperature gauge, a boost gauge and probably a stronger accelerator spring.
Thanks,
Allan


This may help others as well!