YD25 Engines

At YD25.com.au we build standard and premium reconditioned exchange engines.  

Our standard reconditioned exchange engines are built according to the following protocol:

Timing Chains
All engines are fitted with our timing chain conversion kit which includes genuine Nissan duplex timing chains and premium quality parts made in Japan and Australia.

Cylinder Head  
All engines are fitted with a new cylinder head, new valves, new lifter buckets, new shims.

Cylinder Block
The deck is machined and the bores are measured. If the bores are within standard specification they are given a very light hone. If the bores are outside standard specification they are bored oversize. The main bearing caps and the crankshaft tunnel are checked for alignment. If outside of standard specifications the caps and block are machined then precision line bored. The oil galleries welsh plugs and ball bearings are removed allowing total cleaning of the oil gallery system. Oil gallery ball bearings are replaced with BSP tapped bungs. New oil gallery welsh plugs are fitted.

Crankshaft
Crankshaft journals are measured and if within standard specification they are given a very light polish. If the journals are outside standard specification they are reground under size. The ball bearings in the oil galleries are removed to allow thorough cleaning of the oil galleries. The end is tapped and fitted with grub screws.

Conrods
Conrod little ends are fitted with new bushes. Conrod big ends are resized. In some cases we line bore conrod big ends and replace original rod bolts with Automotive Racing Products bolts.

Harmonic Balancer
Correct torqueing of the harmonic balancer bolt requires special tools (that most mechanics don't have).  This is why all our exchange engines are fitted with harmonic balancers.  Correct torqueing to Nissan specifications prevents damage caused by the woodrift key flogging in the crankshaft keyway.

Fuel Pump
All engines are fitted with a fuel pump using the correct alignment shim to ensure accurate sprocket and chain alignment.  This will maximise sprocket and chain life.  We can fit a pump you supply or we can fit one of the new Denso pumps we have in stock.

Internal Engine Balancing
Internal parts are balanced to race tolerances by Brisbane Engine Balancing Pty Ltd. Pistons, piston pins and conrods are balanced to one tenth of one gram. As our engines are balanced the balance shaft assembly is not required. No balance shaft adds to reliability and fuel saving.


Our premium reconditioned exchange engines are built according to the following protocol:

Timing Chains, Cylinder Head, Cylinder Block, Conrods, Harmonic Balancer and Fuel Pump
Same as standard exchange engines.

Conrods
Original conrod big end bolts are replace with Automotive Racing Products big end bolts.

Crankshaft
Our standard crankshaft is upgraded to improve main and big end bearing lubrication.  Our CNC machinist drills additional oil galleries to the big ends and cross drills the journals to create a fully connected crankshaft oil gallery system from main journal 1 through to main journal 5.  This, together with the upgraded oil pump, improves oil flow and continuity of oil pressure to all crankshaft journals.  

Oil Pump
We fit one of our high flow oil pumps designed to maximise the benefits of the premium engine crankshaft upgrade.  We start with a new oil pump housing and machine it to take our high flow billet calmax gears that we manufacture here in Brisbane.  The new pumps are our own design and available exclusively from YD25.com.au.

Internal Engine Balancing
Internal parts are balanced to race tolerances by Brisbane Engine Balancing Pty Ltd. The crankshaft is dynamically balanced to a tolerance of less than one gram.

Warranty
We warrant our engines for a period of 12 months or 20,000 kms (which ever comes first).  The timing chains and sprockets are warranted for 5 years or 100,000 kms (which ever comes first). Only full synthetic oil 5w 30 must be used.  Using any other engine oil voids warranty. Driving to destruction voids all warranty claims.


Automotive Racing Products
We stock YD25 ARP fastners, conrod bolts. main stud kits and head stud kits. Customers can have their premium exchange engine upgraded with these high performance parts.

We at YD25.com.au hope you have found this information useful.

For more information please submit your query using our online form or contact Paul directly on (+61) (0) 424 034 935.

Last updated 23 May 2016

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