Petrol engines spigot-shaft bearing

Introduction

When replacing your T25 engine with another Alt Eng. such as a VW in-line 4 (Golf 1800 etc) it is wise to check whether it actually has a spigot-shaft bearing in the crankshaft recess.

Many do not as their 1st motion shaft /input shaft are short and fully cantilevered from the gearbox bearings.
This requires one to be fitted to suit the T25 g.box spigot.

How to replace a spigot shaft bearing

Aidan: So faced with flywheel

you need to undo the 5 bolts holding it on - it helps to have an impact gun, but failing that a 2 foot bar and another long bar or a flywheel locking tool to hold the flywheel whilst you undo them 10mm Hex

leaves you with

then armed with your puller or slide hammer

fit into bearing and tighten then fit slide hammer

and start to pull it

till it comes out :ok

leaving an empty space in the flywheel with a stop behind

this shows the diesel spigot bearing on the left and petrol on right, the flat face with the writing on faces the gearbox the curved end faces the engine when fitted

as you can see the receiving hole in the crank is 21mm

as is the bearing shell outer diameter

and the inner dimension is 15mm ish - to match the spigot end of the input shaft which will be just under 15mm (like 14.97mm)

and the felt washer on the petrol engine fits in the recess on the back of the flywheel and the sealing o ring sits in the groove, just visible in the picture

Replace the 'O' ring, the washer and the spigot bearing and reassemble - flywheel bolts need to be tight but VW tightening spec is scary tight as previously noted - 60Nm (44ftlb) plus an added 90degrees - you probably won't get them that tight so use a very little threadlock

Lube the new bearing with high temp grease :ok

Links

Here is a link to a forum thread on this, the 2nd link hopefully still pointing one the topic has been moved to the 80-90 Tech Archive in due course.

itchyfeet:
Current forum
Future Archive

From the diesel spigot-bearing topic