View previous topic :: View next topic |
Author |
Message |
Rob1709 *
Age: 32 Zodiac: Joined: 28 Feb 2018 Posts: 13 Location: Basingstoke
|
Posted: Sat Mar 17, 2018 23:30 Post subject: Turbocharger |
|
|
So I've been replacing a turbocharger on my mitsubishi pajero 1994, brought a new one from the online market place, only to find that after replacing the wastegate is opening up as soon as you hit 2k revs, so a full restrip and I've realised the new turbo is an oil and water-cooled model, not just oil as my original was. I've been scouring the Internet for a replacement but can't seem to find one. The model number listed on the original turbo is 49377-03031.
So my question is would this firstly be the reason for the wastegate opening up too early due to the higher temp of no water connection and can anyone recommend where I can find a replacement.
Rob |
|
Back to top |
|
|
Google Sponsor
|
Posted: Sat Mar 17, 2018 23:30 Post subject: Google Ads keep the POCUK free to join! |
|
|
|
|
Back to top |
|
|
peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
|
Posted: Sun Mar 18, 2018 5:58 Post subject: |
|
|
Mine is oil and water cooled.
I didn't trust buying one off eBay so I had mine rebuilt at a turbo specialist, |
|
Back to top |
|
|
Simon_W *******
Joined: 21 May 2013 Posts: 4881 Location: Watford
|
Posted: Sun Mar 18, 2018 9:30 Post subject: |
|
|
Surely the coolant cools the turbo and the oil lubricates it?
I can't see why the lack of coolant would cause the wastegate to open prematurely. Do you have the means to measure the pressure that it's opening at?
Lack of coolant is likely to cause premature bearing wear though. |
|
Back to top |
|
|
peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
|
Posted: Sun Mar 18, 2018 10:11 Post subject: |
|
|
I think the quality of eBay turbos are a bit suspect.
If you look at the prices they are about £150 on average with some even cheaper.
I paid £380 to have mine rebuilt - my reasoning is that you tend to get what you pay for. |
|
Back to top |
|
|
dhammika ****
Age: 49 Zodiac: Joined: 16 May 2015 Posts: 408 Location: Sri Lanka
|
Posted: Mon Mar 19, 2018 10:33 Post subject: |
|
|
If you have replaced the waste-gate, then replace it with the original. |
|
Back to top |
|
|
Pajaromike *
Joined: 26 Feb 2018 Posts: 18 Location: wendover
|
Posted: Wed Mar 21, 2018 22:54 Post subject: |
|
|
I have just had my 98 turbo rebuilt by turbo dynamics, they had to source a rear housing but all in for £370 so will be cheaper than that. As for wastegate, that could be a split in the pipe to the gate, but these are very small turbos and will open early, deisel engines work on very low revs. The only problem you might have is over boosting if the wastegate contiunes to stay open but that wouldnt effect spool tho. Water cooled is really only needed for a unit that runs at high temps, obveriously having both is better, the japs designed & tested their engines alot so if mitsi think oil is only needed then its good enough ? I dont know the range of temps that a 2.8 puts out but proby less than a petrol hence only oil needed.
I also looked at the ebay turbo's, almost certain chinese made which means 60% are garbage and the rest are ok, pot luck really not worth bothering for a reliable vehicle.
Just throwing in my 2 cents.. |
|
Back to top |
|
|
Rob1709 *
Age: 32 Zodiac: Joined: 28 Feb 2018 Posts: 13 Location: Basingstoke
|
Posted: Mon Mar 26, 2018 0:50 Post subject: |
|
|
Thanks for the replies guys, so few days spent removing turbos and refitting, about 45 mins now
So problems lied in actuator arms operating pressure. Run an airline on old turbo and one on new turbo, big difference in pressure to open up the dump valve. Adjusted the new turbo to the same operating pressure of the old one by undoing the retaining screw on the actuator arm and adjusting until pin alignment was near on covering half the hole on the actuator arm and hey presto, no overboosting and pulling like a steam train! |
|
Back to top |
|
|
peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
|
Posted: Mon Mar 26, 2018 5:04 Post subject: |
|
|
Glad you sorted it. |
|
Back to top |
|
|
Pajaromike *
Joined: 26 Feb 2018 Posts: 18 Location: wendover
|
Posted: Mon Mar 26, 2018 8:06 Post subject: |
|
|
I thought it sounded like it was over boosting, job done. |
|
Back to top |
|
|
Simon_W *******
Joined: 21 May 2013 Posts: 4881 Location: Watford
|
Posted: Mon Mar 26, 2018 18:30 Post subject: |
|
|
Rob1709 wrote: |
...... no overboosting and pulling like a steam train! |
Well done.
Are you concerned about the potential need for water cooling on the replacement turbo? |
|
Back to top |
|
|
peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
|
Posted: Mon Mar 26, 2018 19:22 Post subject: |
|
|
Simon_W wrote: |
Are you concerned about the potential need for water cooling on the replacement turbo? |
I would assume the tappings are on the 2.8 block so putting the water cooling pipes on shouldn't be too difficult. |
|
Back to top |
|
|
Pajero James *****
Age: 44 Zodiac: Joined: 14 Jan 2017 Posts: 654 Location: Lost
|
Posted: Mon Mar 26, 2018 21:33 Post subject: |
|
|
Need to change thermostat housing also but no big job. |
|
Back to top |
|
|
Rob1709 *
Age: 32 Zodiac: Joined: 28 Feb 2018 Posts: 13 Location: Basingstoke
|
Posted: Tue Mar 27, 2018 20:21 Post subject: |
|
|
The original turbo was oil fed only. The new turbo is oil fed only. |
|
Back to top |
|
|
Simon_W *******
Joined: 21 May 2013 Posts: 4881 Location: Watford
|
Posted: Tue Mar 27, 2018 20:41 Post subject: |
|
|
Rob1709 wrote: |
... I've realised the new turbo is an oil and water-cooled model, not just oil as my original was. . |
Rob1709 wrote: |
The original turbo was oil fed only. The new turbo is oil fed only. |
|
|
Back to top |
|
|
Rob1709 *
Age: 32 Zodiac: Joined: 28 Feb 2018 Posts: 13 Location: Basingstoke
|
Posted: Tue Mar 27, 2018 20:44 Post subject: |
|
|
Apologies I obviously omitted the part about exchanging the new oil and water-cooled model for straight oil with the seller for the same price. It's been a long few days |
|
Back to top |
|
|
|