Thread: To rebore or not to rebore?

If there is any out of round issues then I would personally bore the motor as you have rightly said the margin of error is small the one thing I will say don't skimp on parts quality as cheap will come back to bite you.

Can you measure the out of round with the head fitted and torqued down?

huh? why would you think you can do that? can you get your measuring tools and hands in the bores of a closed down engine?

Rebore.

Originally Posted by ramblingboy42

huh? why would you think you can do that? can you get your measuring tools and hands in the bores of a closed down engine?

flip it upside down and do it from the crank side.

Many thanks for the feedback.

When the bores were measured we did use a heavy steel deck plate torqued down on the block. The deck plate has bore holes in it that replicate the bore hole positions in the block providing easy access to the top of the bores.

With your feedback and other reading I've done it looks like I need to bite the bullet and rebore to +20.

I've heard that there are a number of german and chinese manufactures that make the +20 pistons to suit. Obviously OEM are the most expensive but are they really necessay?
Does anyone have experience with any brands other than OEM please?

Its interesting that Turners Engineering in the UK list Kolben Schmidt as standard and then offer a cheaper 'Replacement' option which they list as 'not Britpart'.

Cheers,
Simon

Perfect circle pistons are good but don't know if they are made for td5 Chinese pistons are often of poor quality I would steer clear of them. If you can't get a good quality piston I would get in touch with Turners engineering in the UK see if they can supply pistons and rings.

Found the following reference to pistons made by German companies; suitable for the TD5 motor on a UK website. Only Nural and KolbenSchmidt list a standard and over size (+20) piston with Mahle listing only standard. Hope this helps.

NÜRAL 87-140007-00 Piston
84,95 mm, for keystone connecting rod, with cooling duct, with piston ring carrier
Article number: 87-140007-00

Product info:
o Height [mm]:78,94
o Cylinder Bore [mm]:84,95
o Bolt Ø [mm]:30
o Supplementary Article / Info 2:with cooling duct, with piston ring carrier, for keystone connecting rod
o Component Number:08-140007-00
o Compression Height [mm]:47,940
o Recess Diameter [mm]:39,000
o Bolt length [mm]:70
o Recess Depth 1 [mm]:17,400
o Oversize [mm]:0,50
o TecDoc Engine Number:10 P
o Item number87-140007-00
o Our price138,71 £
o Condition New

Add to wish list
£ 195,36**
-29%
£ 138,71
incl. 20% VAT, excl.


NÜRAL 87-140000-00 Piston
84,45 mm, for keystone connecting rod, with cooling duct, with piston ring carrier

Article number: 87-140000-00

Product info:

o Height [mm]:78,94
o Cylinder Bore [mm]:84,45
o Bolt Ø [mm]:30
o Supplementary Article / Info 2:with cooling duct, with piston ring carrier, for keystone connecting rod
o Component Number:08-140000-00
o Compression Height [mm]:47,940
o Recess Diameter [mm]:39,000
o Bolt length [mm]:70
o Recess Depth 1 [mm]:17,400
o Standard Size [STD]
o TecDoc Engine Number:10 P
o Piston Clearance [mm]:0,082
o Item number87-140000-00
o Our price138,71 £
o Condition New
o Reference number OEM :ERR7177

Add to wish list
£ 195,36**
-29%

£ 138,71
incl. 20% VAT, excl


KOLBENSCHMIDT 99418610 Piston
84,942 mm

Article number: 99418610

Product info:
§ TecDoc Engine Number:15 P
§ TecDoc Engine Number:10 P
o Bolt Ø [mm]:30
o Bolt length [mm]:70
o Component Number:61163, 61164, 61165
o Quantity:3
o Production Number:084162
o Bore Ø [mm]:84,942
o Compression Height [mm]:47,69
o Length [mm]:78,69
o Recess Depth 1 [mm]:17,4
o Recess Diameter [mm]:39
o Oversize [mm]:0,44
o Item number99418610
o Our price177,25 £
o Condition New
Contents of the Piston KOLBENSCHMIDT set:
Description of the product
Units
Article number
Piston Ring 1 61163
Piston Ring 1 61164
Piston Ring 1 61165


£ 249,65**
-29%

£ 177,25
incl. 20% VAT


KOLBENSCHMIDT 99418600 Piston

84,442 mm

Article number: 99418600

Product info:
§ TecDoc Engine Number:15 P
§ TecDoc Engine Number:10 P
o Bolt Ø [mm]:30
o Bolt length [mm]:70
o Component Number:79767, 85417, 86654
o Quantity:3
o Production Number:084162
o Bore Ø [mm]:84,442
o Compression Height [mm]:47,94
o Length [mm]:78,94
o Recess Depth 1 [mm]:17,4
o Recess Diameter [mm]:39
o Oversize [mm]:0,06
o Item number 99418600
o Our price177,25 £
o Condition New
o Reference number OEM :LFL 105300
Contents of the Piston KOLBENSCHMIDT set:
Description of the product
Units
Article number
Piston Ring 1 79767
Piston Ring 1 85417
Piston Ring 1 86654


£ 249,65**
-29%

£ 177,25
incl. 20% VAT


MAHLE ORIGINAL 201 46 00 Piston
84,45 mm, with cooling duct, with piston ring carrier
Article number: 201 46 00
Use number: 084162
Product info:

o Cylinder Bore [mm]:84,45
o Length [mm]:79
o Compression Height [mm]:47,94
o Recess Depth 1 [mm]:17,4
o Recess Diameter [mm]:39,0
o Bolt Ø [mm]:30,0
o Bolt length [mm]:70,0
o Connecting Rod Design:Trapezoidal Connecting Rod
o Production Number:084 162
o Supplementary Article / Info 2:with piston ring carrier, with cooling duct
o Component Number:1. T 3 Mo, 2. NM 2, 3. D 3 Cr
o Engine Code:10 P
o Piston Clearance [mm]:0,08
o Item number201 46 00
o Our price250,28 £
o Condition New

£ 352,50**
-29%

£ 250,28
incl. 20% VAT