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TD42 engine assembly

Engines and Engine Systems

TD42 engine assembly

Postby Michael » 17 Mar 2014 11:05

Hi All

I just want to give some background on what I am doing

I bought a Patrol on auction with a stripped engine. After buying it and inspecting it I decided to overhaul the whole engine.

I have now received the engine block back from the engineers and started assembling it over the weekend. Of course they had to skim the block a bit and the piston height above the block are going to be to much now. They currently measure 0.27 - 0.33mm and I think I read on one of the other posts that they should be between 0.025 and 0.03?

Can anyone confirm this?
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Re: TD42 engine assembly

Postby Kagiso II » 17 Mar 2014 12:38

Hi Miche'l .. Jy moet direk met Frans [tour de frans ./. wat NIX met baaisiekels te doen het nioe ] komunikeer oor die een .. al die telleransies sal hy jou mee kan help .

synde jy nounie kiekies van die Trol in AKSIE kan plak nie -- plak dan maar kiekies van die Trol UIT aksie :biggrin:
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Re: TD42 engine assembly

Postby Michael » 17 Mar 2014 12:45

Hi Kagiso

Dankie, ja ek het hom n boodskap gestuur so sal hoor wat hy se.

Man ek het net n paar fotos van die engine en presies wat ek op die engine doen wat ek kan post?
"The Just shall live by Faith" Rom1:17

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Re: TD42 engine assembly

Postby ricster » 17 Mar 2014 13:11

Everything under the head is basically flush, so the only spacing between the piston tops and the valves will be the head gasket thickness. If I recall the head gasket thickness from Nissan comes in 3 thicknesses. I may be wrong on this but I think they are 1.15 - 1.25 and 1.5

The protrusion is a concern.... here's a few quotes from my original post...

a) Fitting the sleeves are simple and engeneering has to do that.The sleeves HAS TO PROTRUED THE BLOCK.According to specs 0.02-0.09mm
b) The head need to be skimmed after that,because the precoms will stand proud.The specs say precom protrusion are -0.05mm.Dont try to get that,some engeneering guys get it wrong and can mess up your head and head.

I don't think the pistons should protrude more than the sleeves !!!
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Re: TD42 engine assembly

Postby Michael » 17 Mar 2014 13:58

ricster I agree, the pistons are way to high but also they have taken a lot of the block away for some reason..... so much that you can barely read the engine number any more.

The Pistons are at the engineer at the moment to be topped so that they don't protrude so much, but not sure how much they should skim off
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Re: TD42 engine assembly

Postby Kagiso II » 17 Mar 2014 14:23

Hi Miche'l - relax oor die kiekies -- as ek nie vir kiekies vra nie is dit nie meer ek nie :-)
maar n kiekie van n leeg enjinbay van n Patrol sal nogal raar wees . daar kannie meer as 5 bestaan nie ?? :rolling: :rolling: QQQ
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Home Town: BrentwoodPark, Benoni
Current 4x4: 1982 Datsun Safari 2,8 aka LOBO; [1,300,000 Km verby !]
'99 PATROL 4,2 diesel.
2012 Jimny [SWAMBO se Kantoor-toe]
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Re: TD42 engine assembly

Postby ricster » 17 Mar 2014 14:25

This is NOT good in my opinion. The thicker the piston top the better. The thinner the piston top, the bigger the chance of a hole in the piston due to high EGT's. There are oil squirters on the block under the pistons that shoot oil onto the underside of the piston crown to assist with cooling of the piston and lubrication.

Why did they have to skim the block? I cannot believe that the block was warped.

I'm thinking that with the new head and the skimmed block it would be better to use a thicker head gasket than to skim the pistons down..... even by a fraction of a millimeter !!!

I'll come through to you tonight after my meeting and lets see. Hopefully Frans can see this before we meet tonight.
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Re: TD42 engine assembly

Postby Michael » 17 Mar 2014 15:22

why they skimmed the block is a long story..... Ill give you the details tonight.

I don't think (hope) the skimming of the pistons will make the piston that much weaker, worst case they will be taking off 0.30mm which is very little but I get what you are saying. I have heard people do it before.
"The Just shall live by Faith" Rom1:17

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Re: TD42 engine assembly

Postby Michael » 25 Mar 2014 14:11

Here are some before and after photos of the progress on the Patrol.

While I am waiting for some engine parts I started working on the suspension a bit, getting it clean and giving it a new coat of paint.
Attachments
suspension_5-1900.jpg
suspension_5-1900.jpg (171.63 KiB) Viewed 1915 times
suspension_4-1900.jpg
suspension_4-1900.jpg (155.92 KiB) Viewed 1915 times
suspension_3-1900.jpg
suspension_3-1900.jpg (228.31 KiB) Viewed 1915 times
suspension_2-1900.jpg
suspension_2-1900.jpg (240.35 KiB) Viewed 1915 times
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff
User avatar
Michael
Moderator
Patrolman 1000+
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Posts: 2311
Joined: 05 Mar 2014 14:39
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Full Name: Michael
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Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans

Re: TD42 engine assembly

Postby Michael » 25 Mar 2014 14:15

And some after.....
Attachments
suspension_12-1900.jpg
suspension_12-1900.jpg (196.19 KiB) Viewed 1914 times
suspension_11-1900.jpg
suspension_11-1900.jpg (188.06 KiB) Viewed 1914 times
suspension_9-1900.jpg
suspension_9-1900.jpg (140.83 KiB) Viewed 1914 times
suspension_8-1900.jpg
suspension_8-1900.jpg (197.6 KiB) Viewed 1914 times
suspension_7-1900.jpg
suspension_7-1900.jpg (147.22 KiB) Viewed 1914 times
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff
User avatar
Michael
Moderator
Patrolman 1000+
Patrolman 1000+
 
Posts: 2311
Joined: 05 Mar 2014 14:39
Location: Centurion, PTA
Has thanked: 121 times
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Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans

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