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| Joined: | 05-01-2005 |
| Location: | Minneapolis, Minnesota USA |
| Posts: | 572 |
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Have you replaced timing belts before? The 907 is an interference engine, which means that if the timing is off, or if the belt jumps timing (too loose), the pistons will hit the valves and bend them all. Things get expensive in a heartbeat. The 907 isn't a good engine on which to learn. It's not especially difficult, it's just not forgiving of mistakes.
To remove the tensioner, you'll just need standard tools. The special thin wrench is only required for adjusting the tension during installation. But you WILL need it before your job is complete, and I don't have a source for you. Check with Delta Motorsports, or maybe someone else on this forum can point you toward an over-the counter bent wrench. Options would be to start with a thin bicycle wrench, and have a shop bend it for you. Or start with a crowsfoot wrench, and have it cut down to the appropriate thickness.
The bearings in that early tensioner are just standard 6005 ball bearings... available through industrial bearing distributors 'everywhere'. Or, contact any Jensen-Healey parts specialist.
JHPS has a tech article about replacing those bearings, here:
http://www.jensenhealey.com/tech/bearing/bearing.html
An alternative to rebuilding would be to replace the old tensioner with the later style tensioner that uses the dedicated tensioner bearing. A purpose-built, double-row bearing in which the outer race is the tensioner's roller. The main advantages of that type of tensioner are:
1) Both the tension adjusting hex head and the retainer nut are on the front of the tensioner. Access is much easier, and no special bent wrench is required.
2) No need to rebuild the old tensioner. Just replace the one-piece, combined bearing/ tensioner roller.
3) The later bearing/ tensioner roller is more durable.
Back in the Fall of 2017, Pieter Van Ruth, qwerty on JHPS, machined up a custom batch of the later-style tensioners, specifically dimensioned to be a drop-in replacement for the early tensioners. He sold them to J-H owners on sort of a group buy basis. You might try touching base with him to see if he's still selling them. Enter "qwerty" in the JHPS forum's search function, or go to this thread:
http://www.jensenhealey.com/forums/view_topic.php?id=2356&forum_id=2&page=1
Regards,
Tim Engel
Last edited on 03-23-2023 03:22 am by Esprit2