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Connecting Rod Bolts - 2020

The lifetime of connecting rod and marine head studs/screws is infinite if undamaged. Studs/screws and nuts should be renewed if damaged or overloaded, shown by permanent elongation when unloaded. The document provides specifications for total length of new bolts/studs for different engine types. Otherwise, studs/screws are only renewed with the connecting rod or marine head. This applies to all 4-stroke Holeby engines, whether hydraulically or mechanically tightened. Elongation should be recorded per SL-2018-666 when hydraulically tightening bolts.

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114 views1 page

Connecting Rod Bolts - 2020

The lifetime of connecting rod and marine head studs/screws is infinite if undamaged. Studs/screws and nuts should be renewed if damaged or overloaded, shown by permanent elongation when unloaded. The document provides specifications for total length of new bolts/studs for different engine types. Otherwise, studs/screws are only renewed with the connecting rod or marine head. This applies to all 4-stroke Holeby engines, whether hydraulically or mechanically tightened. Elongation should be recorded per SL-2018-666 when hydraulically tightening bolts.

Uploaded by

Oliver Dsouza
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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TO WHOM IT MAY CONCERN

The lifetime of the studs/screws for the connecting rod and marine head is basically infinite,
provided the studs/screws, threads and the nuts are without marks and dents.

The studs/screws and nuts should be renewed if you find any indication of damage or if you
suspect that the studs/screws have been exposed to overload.
Any permanent elongation of the bolts/studs in un-loaded condition indicates that they have been
overloaded.
Please refer to below for total length of new bolts/studs:

Engine Type Bolt /Stud Total Length When


New (mm)

L16/24 Bolt – Hydr. 246 +/- 0.1


L21/31 Stud – Hydr. Big End (old) 325 +/- 0.5
Stud – Hydr. Big End (new) 345 +/- 0.5
Stud – Hydr. Marine Head (4 pcs)(-0173) 171 +/- 0.5
Stud – Hydr. Marine Head (4 pcs)(-0178) 179 +/- 0.5
L23/30 – L23/30H Bolt – Man. (4 pcs) 199 +/- 0.1
Stud – Hydr. 266 +/- 0.1
L23/30 Mk III Stud – Hydr. Big End 325 +/- 0.5
Bolt – Man. Marine Head (4 pcs) 124 +/- 0.1
L27/38 Stud – Hydr. Big End 400 +/- 0.5
Stud – Hydr. Marine Head (4 pcs) 206 +/- 0.5
L/V28/32H – L/V28/32S Bolt – Man. (4 pcs) 270 +/- 0.1
Stud – Hydr. 330 +/- 0.1

Otherwise the studs/screws are only renewed together with the connecting rod or marine head itself.

The above mentioned applies to all Holeby designed 4-stroke engines, hydraulically tightened
as well as mechanically tightened 4 screw design.

When tightening the hydraulically tightened bolts – elongation to be recorded as per SL-2018-666.
(See below).

We hope that the above information will be of help to you. If you have any further questions,
please do not hesitate to contact us at PrimeServ Holeby.

Yours sincerely Yours sincerely


Jim Nepper Per Flugt Jensen

Senior Technical Manager, Technical Service Superintendent


PrimeServ, Holeby PrimeServ, Holeby

Edition 2020-01

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