Machine shop
Our own machine shop. Your engine never leaves the workshop.
We grind crankshafts, repair cylinder heads, valves and valve seats, fit cylinder liners and rebuild engines. Every part is measured before and after machining. We work for drivers and for other workshops.
Journal with a keyway for the pulley and the timing gear.
OP-08Main bearing journals ×5We grind them to an undersize matching the new bearings. We measure before and after machining.
OP-01Crankpin journals ×4We grind them to an undersize matching the new big-end bearings. We measure before and after machining.
OP-01Webs and counterweightsThe webs connect the main and crankpin journals, and the counterweights balance the shaft.
OP-08Oil passagesThe passages carry oil from the main to the big-end bearings. After grinding they must be clean.
OP-01Flywheel flangeFace and bolt holes for mounting the flywheel.
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OP-01
Crankshaft grinding
Main and crankpin journals ground to undersize.
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OP-02
Cylinder head repair
Restoring the sealing surface and a complete head repair.
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OP-03
Valve seat repair
Machining the seats so the valves close tightly.
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OP-04
Valve repair
Refacing the valves and lapping them to the seats.
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OP-05
Crack testing of cylinder heads
Finding cracks before the head is repaired and refitted.
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Fitting cylinder liners
Fitting new liners in the block and machining them to size.
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Boring and honing
Cylinders to oversize for new pistons.
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Engine rebuilds
Complete overhaul and assembly.
OP-02 · Cylinder head repair
From the machine to the finished part.
For workshops
We machine it, measure it and hand it back ready to fit.
We work with car workshops from all over Bulgaria. The lead time depends on the part and our workload — call us and we will tell you exactly.
Call for a quote →The engine in section
V engine — what we repair.
Pick a part to see what it is and which operation we use on it. Press “Rotate” to see how it works.
The base of the engine. During a repair we check the cylinders and the deck faces.
OP-07 · OP-08Cylinder linersWorn liners are replaced — we fit new ones in the block and machine them to size.
OP-06PistonsAfter the cylinders are bored, oversize pistons are fitted.
OP-07Connecting rodsThey connect the pistons to the crankshaft. In a V engine two rods share one crankpin.
OP-01CrankshaftWe grind the main and crankpin journals to undersize.
OP-01Cylinder heads ×2Each bank of cylinders has its own head. We repair them and crack-test them.
OP-02 · OP-05Valves and seatsRepairing the valves and valve seats so they seal the combustion chamber tightly.
OP-03 · OP-04CamshaftsThey open and close the valves in time with the crankshaft.
OP-08How it works
From the part to fitting.
The lead time depends on the part and our workload — we confirm it by phone.
- Call usTell us what the part is and what needs to be done.
- Bring or send the partTo the workshop at 157 3-ti Mart Blvd, Montana.
- Measuring and machiningWe measure before and after machining.
- Ready to fitWe hand it back machined and measured.
For drivers
Engine repair in one place.
Removal, machining and assembly in one workshop — no need to find a separate machine shop.
Book a visit →For workshops
A machine shop for workshops all over Bulgaria.
We accept crankshafts, cylinder heads and blocks from other workshops.
Call for a quote →
Questions
Frequently asked about the machine shop.
What do you machine and repair?
Crankshaft grinding, cylinder head repair, valve seat and valve repair, crack testing of heads, fitting cylinder liners, boring and honing cylinders and complete engine rebuilds.
Do you accept parts from other workshops?
Yes. We work for car workshops from all over Bulgaria — we accept crankshafts, cylinder heads and blocks.
How long does it take and how much does it cost?
It depends on the part and its condition. We give lead times and prices by phone only: +359 888 519 891.
Can the whole engine repair be done with you?
Yes. Removal, machining and assembly are done in one workshop in Montana — the engine never leaves the workshop.
How long have you been in business?
Since 2004, first as the official Renault and Nissan dealer and since 2011 as NAYD AUTO. Over 20 years in the trade.
Book a visit